Food List for Sexual Appetite

Foods to Satisfy Your Sexual Appetite
It has been said that the smell, taste, and even the look of certain foods can act as potent aphrodisiacs. Not only are there foods to get you in the mood for love, but some may even make you a better lover. But first you will want to start by doing a little flirting.
Different foods work for different stages of the mating process. Some foods are known to lower your inhibitions, some actually get the blood flowing directly to the genitals and others release feel-good hormones to enhance the sexual experience.
Flirty Foods
Foods that secrete chemicals and hormones and make you feel happy help to increase self-confidence, lower inhibitions, and make you a better flirt.
Chili peppers. Spicy foods get the heart pumping and induce sweating.
Bananas. They contain chemicals that reportedly have a mood-lifting effect on the brain to raise self-confidence.
Carrots. Their phallic appearance and high-fiber content may induce sexual desire. Playing games by sliding it in and out of your mouth will help to put you and your partner in the mood.
Seductive Foods
When you eat foods that stimulate the production of sex hormones, like testosterone, you will receive a quick boost in energy, and increased blood flow to the genitals that will get your body in the mood for love.
Foods that are visually erotic such as oysters, fresh figs, or carrots can get your brain thinking about sex. Other seductive foods include:
Shrimp. Long associated with romance. High in iodine, shrimp and other types of seafood are essential to the thyroid gland, which is necessary for vitality.
Chocolate. Full of caffeine for energy, this palatable delicacy is the ultimate sexual delight.
Ginger. This magical root has been reported to increase blood flow to the genitals in both men and women.
Olives. Green ones are believed to make men more virile, while black ones increase women’s sex drive.
Tomatoes. Red, full and ripe. They have a reputation as a sexual stimulant.
Apples. The original fruit of temptation.
Asparagus. Long and sexy, this phallic-looking vegetable is rich in potassium, phosphorus, calcium and vitamin E, for improved hormone production and increased energy levels.
Foods for the Final Stage
When it comes to the climax, you write your own script. Sometimes just the scent of some aphrodisiacs is enough to increase sexual arousal and enhance performance.
If you think candles that are scented like food are just for enhancing your belly’s appetite—think again! Fragrances such as lavender and pumpkin pie can increase the libido up to 40%.
Floral perfume may not always be the best way to entice your guy. These scents produce only a 3% increase in blood flow to the penis among men. For most women, the smell of men’s cologne can actually lower blood flow to the vagina.
But while the scent of lavender and pumpkin pie has been found to be powerful sexual stimulant for women, the combination of Good and Plenty (licorice-flavored candy) and cucumber has been proven to provide the most potent sexual scent for increasing blood flow to the vaginal area.
It’s likely a combination of physiological and psychological responses are at work. Different foods are linked to past experiences, and tastes and smells naturally vary greatly from person to person as do sexual preferences.
The important thing is to have fun trying different aphrodisiacs to see what adds the right spice to your sex life.

Healthy Cooking Benefits of Olive Oil

Athletes in ancient Greece rubbed in on their bodies, it has been used to anoint the bones of dead saints and martyrs, cultivated since 5000 B.C., the oil of the olive has been sought after for centuries. Believed to be medicinal as well as magical, this golden oil was the popular choice of all royalty.
I like to use olive oil because of its wonderful taste and exceptional health benefits. Of all of the edible fats, extra-virgin olive oil (EEOO) is the most digestible. This particular type of olive oil comes from the first pressing. Less processed than the other grades of olive oil, it is higher in Vitamin E and phenol, a natural inflammatory.
Like I said, extra-virgin olive oil is the healthiest, but all varieties of olive oil offer benefits. This healthy oil helps our bodies to absorb vitamins A, D and K. Packed with essential monounsaturated fatty acids and antioxidants olive oil actually helps to slow down the aging process. No wonder sensible diets like mine always suggest using olive oil.
Recent reports about this wonder oil state that it protects against heart disease by raising the good cholesterol (HDL) while controlling the bad cholesterol (LDL). Successfully proven to slow or eliminate the formation of gallstones, studies show that it may even help to protect against colon cancer.
If you aren’t a regular user of this oil of the gods, then you may want to give it a try. There are different varieties with the extra-virgin olive oil being the healthiest choice.
When shopping for olive oil, keep this in mind:
Extra Virgin Olive Oil: comes from the first pressing, is less processed and offers the most health benefits
Virgin Olive Oil: comes from the second pressing
Pure: filtered and refined, slight processing
Extra Light: processed oil with added olive flavor
Like most oils, olive oil is not cheap. To keep your olive oil as fresh as possible, keep it in a cool, dark place, preferably in a dark bottle. Too much light or oxygen will cause your precious oil to go rancid.
Enjoy it for cooking and be sure to drizzle a little on your veggies before devouring. You’ll be dining like royalty.

What does it mean to be a nutrition Professional?

What does all this mean to the nutrition professional and what of the future? The Internet has already boosted the accessibility of nutrition information and fostered communication between nutrition professionals to a degree that few would have anticipated even four or five years ago. The nutritionist who wants to keep up with the latest developments in their field has unprecedented opportunity to do so. Knowledge has also been democratized-our patients and clients are increasingly likely to come to us with information they looked up on the Internet. 
Essentially, anyone with an inquiring mind and the determination to do so can now access the same information base as any health professional. To a large extent this is a good thing, but it is also important to remember that there is no quality control on the Internet. We will have to help our patients to learn to distinguish reliable science based information from the unreliable non-science-based. Quite how the Internet will develop over the next five years is hard to tell. It is likely that there will be a major growth in the degree of multimedia richness 
and inter activity in nutrition sites-both are relatively primitive in most current nutrition sites (compared to what is commonly seen in web sites dedicated to youth culture and media, for example). We are likely to see an increasing number of interactive web-based nutrition courses available, b0th reputable and less reputable. 
Major web sites devoted to the ever-popular topic of weight loss are already in development, and we will soon feel their influence. Indeed, the Internet will ensure that the spread of the "latest diet"- whether related to weight loss or some other fad-will be faster than ever before. Those who give professional nutrition advice will therefore need to find ways of keeping up with these fads so as to wisely advise their patients and clients. Whatever the direction will be, one thing is certain. With billions of dollars of investment funds pouring into it, and a potential market of hundreds of millions of people, this medium, which has developed so fast in such a short time, has only just begun to unfold its wings. 

Beans and Good Carbs

Beans: Good Carb
Beans are one of the foods that are versatile foods which can be used in mian dishes, side dishes salads and spreads etc. These are not so expensive but more nutritious and healthy food. Beans are source of proteins, carbs and fiber. They have good impact on blood sugar than carbohydrate processed foods. Thats why they are considered as maintaining Blood Sugar.

Good Carbs Effects
Useful carbs come from foods that contain fiber, and bad carbs come from processed foods that tend to be low in fiber. So raising blood sugar steadily. A diet high in processed carbohydrate foods may increase your insulin resistance and metabolic syndrome, an indication to high-blood pressure, high triglycerides, low HDL finally, overweight. Insulin resistance can contribute to diabetes, heart disease and possibly certain cancers. So if you prefer to choose good carbs on or reduce bad carbs can help you in having optimu health and a good weight control.
What are Good Carbs?
Good carbs include all vegetables, whole fruit, peas, beans, lentils and whole grains. Beans do are a good source of carbs but they and other veggs also contain phytonutrients for the protection of health. Besides giving healthy nutrients they also protect health.
What are Bad Carbs?
Bad carbs refer to carbohydrates that are refined such as, snacks, desserts and breads made with added sugars and white flour .
How much should be intake?
If you take good carbs you have fiber intake, and beans provide you with high fiber. For adults  20 g to 30 g of fiber a day.
What benefits Can We get?
Intake of fiber and protein along with iron, zinc and magnesim is associated with intake of beans. Beans increase complex carbohydrates, to reduce saturated carbohydrates you should reduce chease and meat in the meals.
The foods that contain starch and dietary fiber are often known as complex carbohydrates. The foods are grians, corns, beans peas and all foods ade from grains. Vegetables and fruits are rich in fibers, so do come under complex carb category. Besides complex carbs, simple carbs are also beneficial for health and we can find in natural products, such as, lactose in milk fructose of fruits and these include aall naturally occuring sugars.  Added sugar foods are llow in nutrients than natural foods. Besides, Nature is nature.

Calcium - Why is it important for you?

The Romans used lime (calcium oxide), clacked lime (calcium hydroxide), and hydraulic cement in construction works. Calcium (Latin calx, meaning "lime") was first isolated in its metallic form by Sir Humphrey Davy in 1808 through the electrolysis of a mixture of calcium oxide and mercury oxide.

Chelated calcium refers to the way in which calcium is chemically combined with another substance. Calcium citrate is an example of such a chelated preparation. Calcium may also be combined with other substances to form preparations such as calcium lactate or calcium gluconate. Calcium carbonate can be refined from limestone, natural elements of the earth, or from shell sources, such as oyster. Shell sources are often described on the label as a "natural" source. Calcium carbonate from oyster shells is not "refined" and can contain variable amounts of lead.

Calcium is the most abundant mineral in the human body and has several important functions. More than 99% of total body calcium is stored in the bones and teeth where it supports the structure. The remaining 1% is found throughout the body in blood, muscle, and the intracellular fluid. Calcium is needed for muscle contraction, blood vessel constriction and relaxation, the secretion of hormones and enzymes, and nervous system signaling. A constant level of calcium is maintained in body fluid and tissues so that these vital body processes function efficiently.

The body gets the calcium it needs in two ways. One method is dietary intake of calcium-rich foods including dairy products, which have the highest concentration per serving of highly absorbable calcium, and dark, leafy greens or dried beans, which have varying amounts of absorbable calcium. Calcium is an essential nutrient required in substantial amounts, but many diets are deficient in calcium.

The other way the body obtains calcium is by extracting it from bones. This happens when blood levels of calcium drop too low and dietary calcium is not sufficient. Ideally, the calcium that is taken from the bones will be replaced when calcium levels are replenished. However, simply eating more calcium-rich foods does not necessarily replace lost bone calcium, which leads to weakened bone structure.

Hypocalcaemia is defined as a low level of calcium in the blood. Symptoms of this condition include sensations of tingling, numbness, and muscle twitches. In severe cases, tetany (muscle spasms) may occur. Hypocalcaemia is more likely to be due to a hormonal imbalance, which regulates calcium levels, rather than a dietary deficiency. Excess calcium in the blood can cause nausea, vomiting, and calcium deposition in the heart and kidneys. This usually results from excessive doses of vitamin D and can be fatal in infants.

The Surgeon General's 2004 report "Bone Health and Osteoporosis" stated that calcium has been singled out as a major public health concern today because it is critically important to bone health and the average American consumes levels of calcium that are far below the amount recommended. Vitamin D is important for good bone health because it aids in the absorption and utilization of calcium. There is a high prevalence of vitamin D insufficiency in nursing home residents, hospitalized patients, and adults with hip fractures.

Calcium supplements are widely used to reduce bone resorption in osteoporosis, and many studies support this use. Calcium supplementation is also used for colorectal neoplasia and in pregnancy.

EvidenceTable

These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.

Antacid (calcium carbonate) (Grade: A)
Calcium carbonate is an FDA (U.S. Food and Drug Administration) approved over-the-counter (OTC) drug used to treat gastric hyperacidity (high acid levels in the stomach).

Bone loss (prevention) (Grade: A)
Multiple studies of calcium supplementation in the elderly and postmenopausal women have found that high calcium intakes can help reduce the loss of bone density. Studies indicated that bone loss could be prevented in many areas including ankles, hips, and spine.

Cardiopulmonary resuscitation (CPR) (Grade: A)
Calcium chloride may be given intravenously (IV) by a qualified healthcare professional in cardiac resuscitation, particularly after open-heart surgery, when epinephrine fails to improve weak or ineffective myocardial contractions. Calcium chloride is contraindicated for cardiac resuscitation in the presence of ventricular fibrillation. CPR with calcium chloride should only be done under the supervision of a qualified healthcare professional.

Deficiency (calcium) (Grade: A)
Calcium gluconate is used to treat conditions arising from calcium deficiencies such as hypocalcaemic (low blood calcium) tetany (muscle spasms), hypocalcaemia related to hypoparathyroidism (low levels of the parathyroid hormone), and hypocalcaemia due to rapid growth or pregnancy. It is also used for the treatment of hypocalcaemia for conditions requiring a prompt increase in plasma calcium levels (e.g., tetany in newborns and tetany due to parathyroid deficiency, vitamin D deficiency, and alkalosis) and for the prevention of hypocalcaemia during exchange transfusions. Treatment of hypocalcaemia should only be done under supervision of a qualified healthcare professional.

High blood phosphorous level (Grade: A)
Hyperphosphatemia (high phosphate level in the blood) is associated with increased cardiovascular mortality in adult dialysis patients. Calcium carbonate or acetate can be used effectively as phosphate binders. Use may increase calcium-phosphate products in blood. Treatment of high blood phosphorous levels should only be done under supervision of a qualified healthcare professional.

Osteoporosis (Grade: A)
Osteoporosis is a disorder of the skeleton in which bone strength is reduced, resulting in an increased risk of fracture. Although osteoporosis is most commonly diagnosed in white postmenopausal women, women of other racial groups and ages, men, and children may also develop osteoporosis.

Toxicity (magnesium) (Grade: A)
Calcium gluconate is used in the treatment of hypermagnesemia (high levels of magnesium in the blood). Case studies suggest intravenous calcium can aid in the improvement of symptoms. Treatment of magnesium toxicity should only be done under supervision of a qualified healthcare professional.

Black widow spider bite (Grade: B)
Calcium supplementation is used in the treatment of black widow spider bites to relieve muscle cramping in combination with antiserum, analgesics (pain relievers), and muscle relaxants. Treatment of a black widow spider bite should only be done under the supervision of a qualified healthcare professional.

High blood potassium level (Grade: B)
Calcium gluconate may aid in antagonizing the cardiac toxicity and arrhythmia (abnormal heart rhythm) associated with hyperkalemia (high blood potassium), provided the patient is not receiving digitalis drug therapy. Treatment of hyperkalemia should only be done under supervision of a qualified healthcare professional.

High blood pressure (Grade: B)
Several studies have found that introducing calcium to the system can have hypotensive (blood pressure lowering) effects. These studies indicate that high calcium levels lead to sodium loss in the urine, and lowered parathyroid hormone (PTH) levels, both of which result in the lowering of blood pressure. However, one study found that these results did not hold true for middle-aged patients with mild to moderate essential hypertension.

Premenstrual syndrome (PMS) (Grade: B)
There is a link between lower dietary intake of calcium and symptoms of premenstrual syndrome. Calcium supplementation has been suggested in various clinical trials to decrease overall symptoms associated with PMS, such as depressed mood, water retention, and pain.

Bone stress injury prevention (Grade: C)
Calcium supplementation above normal daily dietary intake did not reduce stress fractures in men. Thus calcium supplementation may not be effective in preventing stress fractures but further studies must be done to validate these results.

Colorectal cancer (Grade: C)
Colorectal cancer is the most common gastrointestinal cancer and the second leading cause of cancer deaths in the United States. Colorectal cancer is caused by a combination of genetic and environmental factors, but the degree to which these two factors influence the risk of colon cancer in individuals varies. Most large prospective studies have found increased calcium intake to be only weakly associated with a decreased risk of colorectal cancer. Further studies are needed to verify these results. Treatment of colorectal cancer should only be done under the supervision of a qualified healthcare professional.

Growth (mineral metabolism in very low birth weight infants) (Grade: C)
Growth of very low birth weight infants correlates with calcium intake and retention in the body. It is possible that human milk fortifiers commonly used may have inadequate levels of calcium for infants of very low birth weight. Bone mineralization is also lower in very low birth weight infants at theoretical term than in infants born at term. Use of a formula containing higher levels of calcium has been suggested to allow improved bone mineralization in these infants.

High blood pressure (pregnancy-induced) (Grade: C)
For the general population, meeting current recommendations for calcium intake during pregnancy may help prevent pregnancy-induced high blood pressure (PIH). Further research is required to determine whether women at high risk for PIH would benefit from calcium supplementation above the current recommendations. Treatment of PIH should only be done under supervision of a qualified healthcare professional.

Hyperparathyroidism (secondary) (Grade: C)
In patients on hemodialysis, calcium supplementation may reduce secondary hyperparathyroidism (high blood level s of parathyroid hormone due to another medical condition or treatment). Treatment of hyperparathyroidism should only be done under the supervision of a qualified healthcare professional.

Lead toxicity (acute symptom management) (Grade: C)
A chelating treatment of calcium has been suggested to reduce blood levels of lead in cases of lead toxicity. Reduced symptoms have been observed in most, but not all, patient case reports and case histories. Adequate calcium intake appears to be protective against lead toxicity. Treatment of lead toxicity should only be done under the supervision of a qualified healthcare professional.

Osteomalacia / rickets (Grade: C)
Rickets and osteomalacia (bone softening) are commonly thought of as diseases due to vitamin D deficiency; however, calcium deficiency may also be another cause in sunny areas of the world where vitamin D deficiency would not be expected. Calcium gluconate is used as an adjuvant in the treatment of rickets and osteomalacia, as well as a single therapeutic agent in non-vitamin D deficient rickets. Research continues into to the importance of calcium alone in the treatment and prevention of rickets and osteomalacia. Treatment of rickets and osteomalacia should only be done under the supervision of a qualified healthcare professional.

Osteoporosis prevention (steroid-induced) (Grade: C)
Calcium supplementation in patients on long-term, high-dose inhaled steroids for asthma may reduce bone loss due to steroid intake. Treatment using the prescription drug pamidronate with calcium has been shown to be superior to calcium alone in the prevention of corticosteroid-induced osteoporosis. Inhaled steroids have been reported to disturb normal bone metabolism, and they are associated with a decrease in bone mineral density. Results suggest that long-term administration of high-dose inhaled steroid induces bone loss that is preventable with calcium supplementation with or without the prescription drug etidronate. Long-term studies involving more patients should follow to confirm these preliminary findings.

Prostate cancer (increased risk) (Grade: C)
The lack of agreement among these studies suggests complex interactions among risk factors for prostate cancer. Until the relationship between calcium and prostate cancer is clarified, it is reasonable for men to consume recommended intakes as per the Food and Nutrition Board of the Institute of Medicine. Treatment of prostate cancer should only be done under the supervision of a qualified healthcare professional.

Weight loss (Grade: C)
Diets with higher calcium density (high levels of calcium per total calories) have been associated with a reduced incidence of being overweight or obese in several studies. While more research is needed to understand the relationships between calcium intake and body fat, these findings emphasize the importance of maintaining an adequate calcium intake while attempting to diet or lose weight.

Vaginal disorders (atrophy, wasting or thinning or the vaginal tissue) (Grade: D)
Stopping treatment with topical hormone replacement therapy and switching to treatment with calcium plus vitamin D made vaginal atrophy worse in one study. Increases in painful or difficult intercourse and urinary leaks were reported. Menopausal complaints of hot flashes and night sweats were also worse than before calcium plus vitamin D therapy.

A few must haves for diets

The Sugar-Packed Snack: Yogurt

Brace yourself for culture shock. Plain yogurt naturally contains about 16 grams of sugar per cup. But if you eat flavored yogurt, you could be downing 15 or more additional grams of sugar, which is like shoveling in four extra teaspoonfuls.

Slim Strategy
Choose plain, low-fat yogurt and stir in a teaspoon of honey, maple syrup, or all-fruit spread for a hint of sweetness. Or opt for fat-free Greek yogurt, which is lower in sugar than even regular plain yogurt but often has double the protein to keep you satisfied longer.

The Tricky Treat: Sugar-Free Cookies and Candy

Don't fall for the no-sugar scam: When manufacturers remove the sweet stuff, they often add fat. One popular brand offers chocolate-chip cookies that each contain 160 calories and 9 grams of fat, so why not eat the real thing? You might save calories with sugar-free candy, but many contain sorbitol, which can cause bloating and diarrhea.

Slim Strategy 
Get your cookie fix with graham crackers, which have almost a teaspoon less sugar per serving than many other packaged cookies. Or find a 100-calorie snack pack of your favorite (try Keebler Fudge Shoppe Mini Fudge Stripes). Taking a trip to candy land? Grab a 60-calorie Tootsie Pop or a York Peppermint Pattie (140 calories and 2.5 grams of fat).

The Backpack Bad Guy: Trail Mix

Store-bought versions of this hiking staple should take a hike. A 1-ounce handful of banana chips packs 10 grams of fat (they're usually deep-fried), and yogurt-covered raisins are coated with partially hydrogenated palm kernel oil, which contains saturated and trans fats.

Slim Strategy 
Toss your own trail mix with nuts, dried fruit (raisins or chopped apricots), whole-grain cereal, mini pretzels, and a few chocolate chips. Limit your portion to one cup.

The Mediocre Munchie: Veggie Chips

The rainbow-hued chips are no better than their potato counterparts. While both may boast a little vitamin A or C, your hips won't know the difference: The salty snacks have about 150 calories and 9 or 10 grams of fat per handful. And that bag may contain plain old chips in disguise; sometimes manufacturers simply add food coloring to potato flour.

Slim Strategy 
Be sure your chips list a vegetable, not potato flour or corn flour, as the first ingredient (we like Terra Chips) and stick with just one portion. Or skip them in favor of baked tortilla chips: Pair a serving (about 12 chips) with 1/2 cup of salsa; you'll quell your crunch craving and get a full serving of veggies with only 153 nearly fat-free calories.

Fiber: Not a nutrient, but still importnt

All nutrients are digested in body and must enter cells if they are to be useful. Dietary fiber is part of many foods, and it is important for good health. However, it is not a nutrient because body cannot digest it. The best sources of fiber are cereals and products made with whole grain flour, such as some types of bread and baked goods. Fiber can also be found in fruits and vegetables. There are various types of dietary fiber.
Dietary fiber is made p of complex carbohydrate molecules. However, unlike starch and glycogen, these complex carbohydrates cannot be broken down by your body into smaller glucose molecules. As a result, they cannot enter cells and cannot be used to provide energy.
Because fiber cannot be broken down and absorbed by boy cells, it remains in and moves through body after we eat it. Eventually fiber leaves body with the feces-body's solid waste.
Some types of fiber hold on to water. This helps keep the feces moist, so they move easily through and out of the body. In this way, fiber prevents or relieves constipation.
People who eat very little fiber may suffer from various diseases of the intestines, including cancer. Some people think that eating foods that are high in fiber may reduce the chance of getting these diseases.
Mos nutritionists agree that fiber is very important. We get enough fiber if you eat complex carbohydrates for a large part of energy needs. This is because carbohydrates from plant foods contain fiber as well as starch.

Why do we need balanced nutrition for proper growth?

Human Body

Just like your computer, human body is also made up of matter. The smallest particles of all matter are atoms. Two or more atoms joined together form larger particles called molecules.

There are many different kinds of atoms. An element is a substance that contains only one type of atom. Although there are over 100 different elements, only some of them are found in your body. Other elements make up the remaining portion of a human's mass. For example, there are several grams of phosphorus and more than 1000 g of calcium in the body of a typical adult. Elements such as iron and iodine occur in even smaller amounts. Although these and other elements are present in very small amounts, they are still important. Without them, body cannot work properly.

Most of the elements found in the human body are not present in pure form, but are joined together with other elements to form molecules called compounds. For example, most of the oxygen atoms and hydrogen atoms in your body are joined together to form molecules of water. Water is a compound made up of these two elements.

Some of the elements and compounds found in body are used to build or repair body cells. Other elements and compounds supply energy to the cells in your body. Cells are the tiny subunits that make up all living things. Inside cells, many chemical reactions occur. It is these chemical reactions that keep your body alive and active. For the reactions to occur, cells need energy. This energy as well as the substances cells need for growth and repair comes from the food.

Why your body needs food?

Your body is made up of skin, muscle, bone, blood and many other materials. Where do these  materials come from? How does your body repair broken bones or replace blood when your bleed? As you grow, your boy makes new skin and muscle, as well as bone and other types of material. Where does this new material come from? Just as a car needs fuel to run, your body needs energy to power all its activities. Where does your body get its energy?
We get it "from the food we eat". Food contains many different substances. Some of these substances provide you with energy as well as with materials that body needs to grow and repair itself. You are what you eat.
Nutrition
Nutrients in the food you eat contain the many different elements and compounds that your body needs. A nutrient is any material that can be taken into your body cells and that is useful to your body. The nutrients in food supply the energy and the material your body needs to grow and survive.
Nutrition is the study of the nutrients in food and the effect of these nutrients on your health. Sometimes people use "nutrition" and related words to refer to healthful foods or good eating habits. For example, a meal that contains a good balance of  the nutrients body needs is often called "nutritious". If a person practices good nutrition, she or he selects nutritious foods and eats just enough of them to supply the body's needs.
Good nutrition is especially important for a teenager because of the many changes taking place in body. Adolescence is a time of rapid growth and development. Many of  bones grow longer, causing your height and overall size to increase. Muscles also grow larger, increasing strength. Body may produce more fat. Such body growth requires a lot of energy and large amounts of certain elements and compounds. Teenagers need different amounts of nutrients than either children or adults. In addition, no two teenagers have exactly the same nutritional needs.
Human body needs many different nutrients. There are about six nutrients which make a diet balanced. The nutrients in each six are important since they help body grow, repair itself or work properly.

Pathways of carbohydrate metabolism

Pathways of carbohydrate metabolism 
Uptake of glucose into the cells is the limiting step in its utilization in many tissues, including muscle, heart, and adipose tissue. Insulin is essential for glucose entrance to these tissues, whereas the process is independent of insulin in the liver and CNS.
Equally important and possibly related to glucose uptake is its phosphorylation to glucose-6-phosphate by herokinases before it can enter the metabolic pathways of the cell. This reaction is practically irreversible in most tissues. Once glucose-6-phosphate is formed, it must en­ter the metabolic pathways and cannot be returned to the blood except from the liver and kidney, where another enzyme, glucose-6-phosphatase, can release free glucose. Glucose-6-phosphate serves as a link behveen the major pathways of glucose metabolism.
In contrast to the extrahepatic tissues, insulin regu­lates the metabolism of glucose in the liver after its uptake by affecting the activities of hexokinase and other hepatic enzymes.

The citric acid cycle (CAC, Krebs Cycle)

The citric acid cycle (CAC, Krebs Cycle) 
This oxidative cycle serves as a melting pot for the products of carbohydrate, fat, and protein metabolism after initial catabolism in separate pathways. Even though it is sometimes considered as a pa thway of glucose oxidation because of the carbohydrate nature of its inter­mediates, the citric acid cycle does not discriminate on the basis of the origin of its substrates. Furthermore, the catabolism of several amino acids also provides inter­mediates for the cycle.
The key compound that channels the carbons of glucose, amino acids, and fatty acids into the cycle is acetyl CoA (or active acetate). The condensation of acetyl CoA with oxaloacetic acid initiates the series of reactions that result in the oxidation of the two acetate carbons into CO2, with regeneration of Co A and oxaloace­tic acid (OAA). Even though OAA is not used up in the cycle, its supply can become limiting for the oxidation of acetyl CoA because there are other uses for OAA, as is shown in the subsequent sections. OAA is produced from carboxylation of pyruvate by a biotin-dependent pyruvate carboxylase and is plentiful when carbohydrates are ac­tively metabolized. Catabolism of certain amino acids also replenishes the supply of the CAC intermediates and is especially important when the supply of carbohydrates is limited.
The energy generated in the oxidative steps (de­hydrogenations) of the cycle is utilized in the concomitant reduction of coenzymes NAD+ (nicotinamide adenine di­nucleotide) and FAD (flavin adenine dinucleotide) and thereby conserved as reducing equivalents (NADH + H+ and FADH2). This energy can then be reclaimed by reox­idation of the coenzymes in the respiratory chain, or it may be directly used in synthetic reactions involving re­ductive steps specific for these coenzymes.

Biologic oxidation of foodstuffs n

Biologic oxidation of foodstuffs 
Liberation offood energy in the body is not a process of instant combustion as in the bomb calorimeter. It is a slow, gradual redistribution of energy of the original mol­ecules into intermediates oflower energy value with con­comitant release of both heat and usable energy (as ATP) from the oxidative and other energy-yielding reactions of the metabolic pathways.
Biologic oxidations include all reactions in which electrons are removed from an atom or ion that is part of the substrate; in some oxidations, the electron loss is accompanied by an addition of oxygen to or removal of hydrogen from the substance being oxidized. Oxidation of one substance (loss of electrons) always results in the reduction of another substance (gain of electrons, which may be accompanied by loss of oxygen or gain of hydro­gen); oxygen is commonly referred to as an oxidizing agent or electron acceptor. Although oxygen may serve as an electron (hydrogen) acceptor in biologic reactions, with the formation of water (H20) or hydrogen peroxide (H202), most of the intermediary steps in the oxidation of foodstuffs initially involve other electron or hydrogen ac­ceptors. The major ones are the coenzymes, nico­tinamide adenine dinucleotide (NAD+) and flavin ade­nine dinucleotide (FAD). Both are required for the initial breakdown of glucose, amino acids, and fatty acids as well as the final oxidative cycle of energy production, the citric acid cycle, where the carbons of these nutrients become oxidized to CO2, The resulting reduced co­enzymes, often referred to as reducing equivalents (NADH + H+ and F ADH2), are either used in the synthesis of new compounds (in energy requiring reductive steps) or reoxidized by the enzymes of the respiratory chain. Oxygen serves as the final hydrogen acceptor in this step­wise electron transfer, which is accompanied by capture of energy as A TP in the so-called oxidative or respiratory chain phosphorylation. This oxidative phosphorylation at the respiratory chain level is the major means of ATP production in the body.
A sizable fraction of total ATP formation takes place directly at the substrate level, linked to the cleavage of a high-energy bond, as seen in the conversion of 1,3-di­phosphoglyceric acid to 3-phosphoglyceric acid in the glycolytic breakdown of glucose.The quantitative aspects of ATP production from oxidative metabolism are discussed in the following sections.

Metabolism

Metabolism

When the nutrients in the bloodstream pass through the cellular membranes of the body, they enter into the metabolic processes of the cell. Metabolism may be de­fined as a process by which the cells convert nutrients from food into useful energy, which can be utilized for performance of work as well as for synthesis of new compounds vital for cellular structure and function. The process by which nutrient molecules are degraded, with concurrent release of energy and subsequent elimination of waste products, is generally known as catabolism, whereas anabolism refers to the synthesis of new com­pounds. The anabolic processes depend on energy from the catabolic processes, both proceeding simultaneously.

Some may be linked together through common inter­mediates. Metabolism is an ongoing process in every cell of the body, requiring a continuous supply of nutrients.

Wide variations exist among groups of people and individuals in their daily intake of foods. Some people have meals at stated times others cannot or do not. Fortuna tely, mechanisms exist that allow a steady flow of nutrients to the cells to continue for limited periods of time, even though no food is ingested.

In the period immedia tely following ingestion of food, the levels of most nutrients in the blood rise due to absorption from the intestine. The rate of absorption varies with the nutrient, the quantity ingested, and the person, but in general the peak level for carbohydrate (glucose) is reached in 1 hour and for fat (chylomicron triglycerides) in 4 to 6 hours. At the same time the uptake of nutrients by the tissues also is rapid and eventually exceeds the rate of flow from the intestine, resulting in a gradual decline in the blood nutrients to fasting levels. In most people fasting levels for triglycerides are attained in 8 to 12 hours and for glucose in 2 to 3 hours.

The rate of protein (amino acid) absorption falls somewhere behveen those of carbohydrate and fat. How­ever, the changes in the amino acid concentration and pattern in the blood are relatively small after protein ingestion because the absorbed amino acids pass through the liver, which removes a large proportion of them and controls their release to the general circulation.

Upon reaching the cells, some ofthese nutrients enter the catabolic pathways to supply energy for immediate needs. Aside from small functional needs, the remaining nutrients are converted to various storage forms from which they can be recalled later when needed.

Glucose is converted to glycogen to replenish the tissue stores, but due to the body's limited ability to store gycogen, the remaining glucose is converted to fat and stored as triglyceride, mostly in the adipose tissue and, to a lesser extent, in the liver and muscle. Excess dietary fatty acids also are stored as triglyceride. Protein synthesis in the tissues is high after ingestion of a balanced mixture of amino acids the excess is either oxidized to provide energy or first converted to glucose or fat. 

Phospholipids

Phospholipids

Phospholipids are found in foods of both animal and plant origin although in relatively small amounts. The main dietary phospholipid is lecithin. and, like cholesterol, it becomes mixed with endogenous leci thin both in the intestinal lumen (from bile) and inside the mucosal cell (synthesized).

Before absorption, lecithin and other gylcero­phospholipids are hydrolyzed to lysophospholipids by pancreatic phospholipase A, which removes the fatty acid in the 2-position of the glycerophosphatides. Lysolecithin and other lysophosphatides participate in micelle formation in the intestine and are absorbed by passive diffusion like the other lipid digestion products. Lysophospholipids undergo extensive breakdown and re­synthesis in the mucosal cell. Some parts of the molecule may be found in triglycerides or in other phospholipids manufactured in the cell. Phospholipids are important structural components of the triglyceride transporting chylomicrons and other lipoproteins and are actively syn­thesized in the mucosal cell. 

Cholesterol

Cholesterol

Cholesterol is an essential component of all animal cells and, therefore, is ingested in foods of animal origin. The average daily intake in a typical American diet is estimated to be 600 mg to 800 mg, but undoubtedly higher as well as lower intakes are common. Some cho­lesterol is also secreted into the intestinal tract in bile and becomes mixed with the dietary cholesterol. It exists ei­ther free or esterified \vith fatty acid, but the latter are cleaved in the intestine by pancreatic cho­lesterol ester hydrolase before absorption. The amount of cholesterol present in the intestines is small compared to the triglycerides and their digestion products, and it is easily solubilized within the bile salt-lipid micelles from which it is absorbed. It is well known that both dietary fat and bile stimulate cholesterol absorption. In addi tion to facilitating the solubilization of cholesterol, bile salts are required to activate the pancreatic cholesteryl ester hydro­lase. Onlv free cholesterol is believed to be absorbed into the mucosal cell.  

Further mixing of dietary with endogenous cho­lesterol occurs in the mucosal cell, which actively synthe­sizes this compound. Some intracellular reesterification of free cholesterol also takes place, and both free and esterified cholesterol are incorporated into chylomicrons (60% 80% esterified) and the VLDL.

The extent to which dietary cholesterol is absorbed in humans seems to be variable, and the information available is somewhat contradictory, especially about the effect of the level of dietary cholesterol on the percentage and absolute amount of cholesterol that reaches the blood.

The results of several studies support the view that within the common range of cholesterol intake in Amer­ican diets the amount of cholesterol absorbed is directly proportional to the dietary intake. The percentage of ingested cholesterol absorbed seemed to average 40% to 50% of the intake. In a number of studies, cholesterol absorption in patients with diagnosed hypercholes­terolemia has been found to be normal.

It is generally agreed that with high cholesterol in­takes there is a gradual decrease in the percentage ab­sorbed,17 but the total absorption still increases with intake. The amount and type of triglycerides ingested simultaneously also influences cholesterol absorption.

Medium chain triglycerides (MCT)

Medium chain triglycerides (MCT) 
The digestion and absorption of medium chain and short chain triglycerides are similar; therefore, the discus­sion in this section pertains to both, although only MCTs are referred to. Gastric lipase, which has practically no activity in digesting LCT, can initiate the breakdown of M CT. Though gastric lipolysis is considered insignificant in the digestion of fat in general, it may be important when a sizable proportion oftotal fat intake is in the form ofMCT, as is recommended for certain therapeutic diets and in the digestion of milk fat. In the intestinal lumen, MCTs are rapidly hydrolyzed into monoglycerides and fatty acids by the pancreatic lipase. In contrast to the long chain monoglycerides, a considerable proportion of medium chain mono­glycerides normally undergoes further hydrolysis to glycerol and fatty acids before absorption.
Both intact MCTs and their digestion products are readily dispersed in the aqueous intestinal contents; as a result, although the presence of bile salts stimulates their digestion and absorption, these processes proceed rela­tively rapidly, even in bile-deficiency states in which inges­tion of LCT causes severe steatorrheaY .Uptake into the mucosal cell can also proceed at any stage of digestion; even intact MCTs can enter the cell when luminal hydrolysis is incomplete, as in patients with pancreatic insufficiency. Once they are inside the mucosal cell, the hydrolysis of these glycerides (mono di, and triglycerides) is completed by intracellular lipases, which have little activity with long chain glycerides. This intra cellular lipolysis is followed by rapid removal of the fatty acids from the cell. Unlike the LCT fatty acids, which are absorbed into the lymphatics, the bulk of the MCT fatty acids are directly absorbed into the portal circulation and carried to the liver, where they are readily metabolized.
Lauric acid (12 carbons), found especially in coconut oil, is usually classified as a medium chain fatty acid. In intestinal absorption, it seems to be on the borderline beh'leen the long chain and medium chain fatty acids. Although some lauric acid enters the circulation through the portal route, a considerable proportion is reesterified and enters the lymph in chylomicrons. To some extent the same is true with other fatty acids below and above lauric acid in chain length, but proportionally the portal route is the major one for fatty acids with fewer than 12 carbons and the lymphatic system for those \vith more than 12 carbons.
The therapeutic value of MCT preparations is based on their special behavior in digestion, absorption, and transportation. But more recently they have proven benefi­cial in the rare disorders of lipid transport in which chylomicron removal from the blood is defective.

Long chain triglycerides (LeT)

Long chain triglycerides (LeT) 
The mechanical and chemical actions ofthe stomach release the food fat from the protein and carbohydrate. Fat enters the duodenum in a coarse, unstable emulsion. Two digestive juices essential for normal lipolysis of fat are secreted into the upper duodenum, bile and the pan­creatic juice. The mechanical action of the intestine and the emulsifying capacity of the bile salts and phos­pholipids of the bile allow formation of a finely divided stable emulsion. The emulsified fat droplets consist mainly of triglycerides and of lesser amounts of di­glycerides and fatty acids. They form what is known as the oil phase, which is dispersed in the bulk of the intestinal contents, the water phase.
The enzymatic hydrolysis oftriglycerides takes place at the oil-water interphase by pancreatic lipase (glycerol ester hydrolase) present in the water phase. The finer the emulsion, the larger the surface area available for the enzyme action; an ample supply of lipase is normally available, making the accessibility to the substrate mole­cules the determining factor for the rate of lipolysis. Pancreatic juice also contains a peptide molecule known as colipase. Colipase increases the activity of pancreatic lipase, probably by strengthening its binding to the sub­strate. The role of colipase appears to be especially impor­tant in the presence of a high concentration of bile salt which, although essential for the emulsification of dietary fat, also weaken or prevent the binding of lipase to its substrate at the water-oil interface and thereby inhibit triglyceride hydrolysis. This inhibition is prevented by colipase.
The intestinal digestion of long chain triglycerides consists of two essential steps: hydrolysis and solubiliza­tion ofthe end products. The pancreatic lipase releases the fatty acids esterified at carbons 1 and 3 of the triglyceride glycerol (also known as a-positions) .The resulting free fatty acids and 2-monoglycerides (remaining fatty acid in ,B-position) are solubilized and removed from the site of hydrolysis through formation of micelles with conjugated bile salts. Small amounts of other lipids are also found in these micelles, including cholesterol, phospholipids, and the fat-soluble vitamins. Though the micelles are aggre­gates of molecules, they are much smaller than the emul­sified triglyceride droplets, and they form a clear dis­persion in the aqueous medium in the lumen (water phase). The major luminal events of LCT digestion and absorption.
Micelle formation allows the monoglycerides and fatty acids to make close contact with the absorptive surfaces of the epithelial brushborder by facilitating their diffusion through the unstirred wa ter layer. The minimun level of bile salts required to accomplish complete solubil­ization of the insoluble monoglycerides and fatty acids is known as the critical micellar concentration (CMC) of bile salts. Below this level some of the end products ofhydroly­sis remain in the oil phase, and the entire process of digestion and absorption is slowed down.
LCTs are absorbed into the epithelial cell as mono­glycerides, fatty acids, and glycerol. Glycerol is produced by limited hydrolysis of micellar monoglycerides, proba­bly by intestinal lipase. About two-thirds to three­fourths of the dietary LCTs are absorbed as mono glycerides. The exact mechanism by which they enter the epithelial cell is not known, but the available evidence points to passive diffusion across the lipoprotein membrane.
At the site of absorption the bile salts separate from the rest of the micellar components and move farther down the intestinal lumen to the ileum, where about 95% are reabsorbed. They pass through the mucosal cell and into the capillaries of the portal system, which carries them back to the liver. If the bile salts are deconjugated in the intestine (by bacteria) before reabsorption, they, reconjugated in the liver and, along with the newlysyntl sized bile salts, are secreted into the gallbladder ready be released once more into the duodenum as needed. Trecycling is known as the enterohepatic circulation oft salts.
The small fraction of bile salts lost daily in the fece: replaced by synthesis from cholesterol in the liver. Activi ty represen ts the major means of cholesterol remo from the body and can be increased by administration certain drugs, such as cholestyramine, which binds 1 bile salts, preventing their reabsorption and thereby creasing the conversion of cholesterol in to bile acids in 1 liver. The net result is a reduction in blood cholesterol hypercholesterolemic people.
The intracelluar phase in the absorption ofLCT is major importance. The entering fatty acids a monoglycerides become mixed with those already present.In the cell and lose their "identity." They also must un­dergo reconversion into triglycerides before leaving the cell. The major pathway involves the direct acylation of the monoglycerides, and its activity responds to the changes in the dietary in take of fa 1.
The newly synthesized triglycerides are "packaged" in to lipoprotein particles known as chylomicrons. The core of these particles consists of triglyceride and some cho­lesterol. They are covered with a protein-phospholipid "wrapping," which allows them to be dispersed in water. The Golgi complex of the mucosal cell appears to be the site for the completion of chylomicrons before their re­lease. Some of this dietary or exogenous triglyceride is incorporated into very low densi ty lipoproteins (VLDL) by the epithelial cells, although this blood lipoprotein frac­tion is mainly knOVII1 as the carrier of endogenous triglyc­erides synthesized in the liver.
Both lipoprotein particles are then released from the cells and enter the lacteals, the small vessels of the lymphatic system in the lamina propria. The contents of the lymph reach the left subclavian vein through the thoracic duct and, from there, the various sites ofutiliza­tion in the body.

Fats and other lipids

Fats and other lipids 
Of the dietary lipids, 90% to 95% are triglycerides, generally known as fats. Small amounts of di- and mono­glycerides, cholesterol, and phospholipids are also in­gested. Digestion, absorption, and transport of fat in the body present special problems because of the insolubility of fat in the intestinal contents and other body fluids. Depending on the length of the carbon chain of the con­stituent fatty acids, there are also differences in the sol­ubility of triglyceride molecules and, therefore, in the ways that the body handles them.
The bulk of fat in a normal diet consists of so-called long chain triglycerides (LCT) with fatty acid length from  carbons up (including some 12 carbon fatty acids). Medium chain triglycerides (MCT, predominantly 8-10 carbon fatty acids) are of little significance except in therapeutic diets consumed by patients with certain mal- absorption syndromes. Short chain triglyc­erides (SCT, less than 8 carbons) are used in a manner similar to MCT and are found mainly in milk fat.
Al though differences exist in the ra te of absorption of triglycerides \vith different fatty acid composition (chain length and saturation), it is rapid enough in healthy peo­ple to allow 95% to 99% absorption \vith intakes up to 250 g per day.
Because of the completeness of fat absorption in healthy adults, comparative studies of the absorption ra tes of dietary fa ts have been conducted mainly in disease states with reduced overall fat absorption or in premature infants whose capacity to handle dietary fat is also lim­ited. It is evident from such studies that the melting point of fat influences the rate at which it is absorbed. For this reason, very hard fats, those with a large proportion of completely saturated long chain fatty acids, are absorbed less readily than liquid oils with a high content ofunsatu­rated or short chain fatty acids. The effect of triglyceride composition on the overall rate of fat absorption can probably be attributed to differences both in the rate of hydrolysis and in the rate of absorption of the end prod­ucts, although the mechanisms involved are not known. As was mentioned earlier, these differences are of little significance in healthy people but may be very important in determining the extent of steatorrhea present in certain malabsorption syndromes.

Mechanisms of absorption

Mechanisms of absorption 
The nutrients presented for absorption at the mucosal brushborder vary \videly in molecular size, sol­ubility, and other properties. Due to the unique nature of the lipoprotein membrane ofthe microvilli, several mech­anisms are necessary to ensure passage into the cell of all nutrients regardless of their size and solubility. Also, as was pointed out, the nutrients encounter several different barriers while passing from the luminal to the serosal side (lamina propria) of the epithelial cell and finally into the blood or lymph vessels. Therefore, more than one mecha­nism is likely to be involved in the total absorption process for anyone nutrient. When a solute passes "downhill" from a higher to a lower concentration, it is said to move along its con­centration gradient; the process does not require expendi­ture of energy and is known as passive transport. In the same manner osmotic pressure differences and electrical gradients across the membranes also can determine the direction of the movement of water and ions, respectively, by passive mechanisms.
During intestinal absorption many nutrients are transported "uphill," against the gradient; this can be accomplished only by expendi ture of energy, and the pro­cess is known as active transport.
Several nutrients are knovm to be absorbed bv both active and passive mechanisms. Furthermore, it is likely that in active absorption only one step, such as entrance into or exit from the mucosal cell, requires energy.

Carbohydrates

Carbohydrates 
Carbohydrate (starch) digestion begins in the mouth by the action of salivary amylases, which are capable of degrading starch to maltose and a    limit dextrins. The significance of salivar: Digestion is limited by the usually short stay and incomplete mastication of food in the mouth. By the time the food is well mLxed with the gastric juice in the stomach, the action of salivary amylase is inhibited by the low pH of the medium.
The small intestine is the major site of carbohydrate digestion and absorption. In the luminal phase pancreatic amylases continue the degradation of starch where the salivary action ends, yielding maltose, maltotriose and other oligosaccharides (up to 9 glucose units), and a-limit de.xtrins (1,6 linkages at the branching points). No free glucose or isomaltose is formed in the lumen.
The final stages of carbohydra te digestion take place by membrane-bound enzymes on the luminal side of the lipoprotein membrane of the mucosal cell (the brush­border phase). The brushborder exhibi ts multiple enzyme activity, which results in the hydrolytic breakdown of di­and oligosaccharides. As a result, the digestion of starch is completed by production of glucose from a-limit dextrins by a-dextrinase (previously called isomaltase) and from maltose and oligosaccharides by gIucoamylase (maltase). The common dietary disaccharides, sucrose and lactose, are also hydrolyzed by the mucosal disaccharidases, sucrase and lactase, respectively. Sucrase activity is actu­ally part of a hybrid molecule, which also hydrolyzes the 1,6 linkages of a-limit dextrins and, for this reason, is referred to as sucrase-a-dextrinase. Sucrase activity is known to respond to changes in the intake of sucrose.Only monosaccharides can enter the mucosal cell and, subsequently, the blood. Deficient mucosal disaccha­ridase activity is the cause of a group of malabsorption syndromes.
The membrane digestion is closely integrated "vith the absorption of the resulting monosaccharides. Only lactase activity limits the rate of the absorption oflactose. From other substrates, monosaccharides are produced at a rate greater than the mucosal uptake, and some diffuse to the intestinal contents, from which they are absorbed later at a site distal to the site of their production.
Glucose and galactose are believed to share a com­mon carrier system for the uptake into the mucosal cell. Although some ofthis transport is passive during the peak period of their production, the bulk of these sugars is absorbed by a process linked to the transport ofNa+. The exact nature of this process is still unsettled despite the many models that have been proposed for the system.
The most widely accepted theory!! suggests that glucose and galactose are transported together with so­dium by a carrier, which facilitates the diffusion of so­dium into the cell along the concentration gradient. The monosaccharide is bound to the same carrier and, because of this coupling, can be transported into the cell against its concentration gradient. The monosaccharides can then exit by diffusion downhill, and enter the portal vein. According to this theory, the step that requires en­ergy in the absorption of glucose and galactose is the expulsion of sodium from the cell.
Fructose absorption proceeds at a slower rate than tha t of glucose and galactose and has been assumed to be by a passive mechanism, although the rate is relatively high when compared to passive transport of other sugars. Existence of a separate specific mechanism for fructose transport is suggested by studies on sugar absorption in a patient ,vith the rare defect known as glucose-galactose malabsorption. An adult diagnosed as having this condition showed only minimal absorption of glucose and galactose (believed to be by passive diffu­sion). The rate of fructose absorption was normal, about four times that of glucose and galactose, suggesting a mechanism of facilitated diffusion.
After leaving the mucosal cell all monosaccharides enter the capillaries of the portal venous system and are carried to the liver, where fructose and galactose are readily converted to glucose.