Protein-containing supplements, either ready-to-drink or as powders to be mixed into water, are marketed as aids to people recovering from illness or injury, those hoping to thwart the sarcopenia of old age, to athletes who believe that strenuous physical activity increases protein requirements, to people hoping to lose weight while minimizing muscle loss, i.e., conducting a protein-sparing modified fast, and to people who want to increase muscle size for performance and appearance. Whey protein is a popular ingredient, but products may also incorporate casein, soy, pea, hemp or rice protein.
Dietary supplement labels may carry certain types of health-related claims. Manufacturers are permitted to say, for example, that a dietary supplement addresses a nutrient deficiency, supports health, or is linked to a particular body function (like immunity or heart health). Such a claim must be followed by the words, "This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease."
Access to correct information about food and essential nutrients, including knowledge about the importance of food for health is a fundamental human right. Such information should not only provide a summary of the nutrient content of food, but in our opinion should also explain how dietary supplements can counteract deficiencies and prevent and reverse disease caused by nutrient deficiencies. We should be free to purchase quality-controlled supplements of essential nutrients and to use them to counteract aging and damage from stress as part of a long-term health plan. The right to reject recommendations by doctors for symptomatic treatment with synthetic, some times life-threatening, drugs to alleviate symptoms should be included. [48,49]
Salivary response. Salivation is part of the experience of eating food, and the more a food causes you to salivate, the more it will swim throughout your mouth and cover your taste buds. For example, emulsified foods like butter, chocolate, salad dressing, ice cream, and mayonnaise promote a salivary response that helps to lather your taste buds with goodness. This is one reason why many people enjoy foods that have sauces or glazes on them. The result is that foods that promote salivation do a happy little tap dance on your brain and taste better than ones that don’t.
People use dietary supplements for a wide assortment of reasons. Some seek to compensate for diets, medical conditions, or eating habits that limit the intake of essential vitamins and nutrients. Other people look to them to boost energy or to get a good night's sleep. Postmenopausal women consider using them to counter a sudden drop in estrogen levels.
A well-balanced diet, comprised of a variety of foods, adequately meets women’s needs for vitamins, minerals and energy. For good health, women need to pay special attention to calcium, iron and folate (folic acid) intake. A healthy diet also should minimize the intake of fat and sugar. Diets high in saturated or trans fat can promote high levels of blood cholesterol and increase risk for heart disease. A diet that includes high sugar provides empty calories, or calories that do not provide any nutritional value and often times replace more nutritious food selections.
A person's caloric requirement depends on his body size and exercise level. Sedentary people of both genders will keep their weight stable by taking in about 13 calories per pound of body weight each day. Moderate physical activity boosts this requirement to 16 calories a pound, and vigorous exercise calls for about 18 calories a pound. On average, a moderately active 125-pound woman needs 2,000 calories a day; a 175-pound guy with a similar exercise pattern needs 2,800 calories. And like women, men will lose weight only if they burn more calories than they take in.
When she turned 60, Pearl decided she wanted to stay healthy and active as long as possible. She was careful about what she ate. She became more physically active. Now she takes a long, brisk walk three or four times a week. In bad weather, she joins the mall walkers at the local shopping mall. On nice days, Pearl works in her garden. When she was younger, Pearl stopped smoking and started using a seatbelt. She’s even learning how to use a computer to find healthy recipes. Last month, she turned 84 and danced at her granddaughter’s wedding!
The average American diet leaves a lot to be desired. Research finds our plates lacking in a number of essential nutrients, including calcium, potassium, magnesium, and vitamins A, C, and D. It's no wonder that more than half of us open a supplement bottle to get the nutrition we need. Many of us take supplements not just to make up for what we're missing, but also because we hope to give ourselves an extra health boost—a preventive buffer to ward off disease.
Salt, caffeine and alcohol intake may interfere with the balance of calcium in the body by affecting the absorption of calcium and increasing the amount lost in the urine. Moderate alcohol intake (one to two standard drinks per day) and moderate tea, coffee and caffeine-containing drinks (no more than six cups per day) are recommended. Avoid adding salt at the table and in cooking
It's a cliché, to be sure, but a balanced diet is the key to good nutrition and good health. Following that diet, however, isn't always that easy. One challenge is that women often feel too busy to eat healthfully, and it's often easier to pick up fast food than to prepare a healthy meal at home. But fast food is usually high in fat and calories and low in other nutrients, which can seriously affect your health. At the other extreme, a multimillion dollar industry is focused on telling women that being fit means being thin and that dieting is part of good nutrition.
Fiber is an important part of an overall healthy eating plan. Good sources of fiber include fortified cereal, many whole-grain breads, beans, fruits (especially berries), dark green leafy vegetables, all types of squash, and nuts. Look on the Nutrition Facts label for fiber content in processed foods like cereals and breads. Use the search tool on this USDA page to find the amount of fiber in whole foods like fruits and vegetables.
However, some herbal supplements may not be safe. They could contain unlisted ingredients that make you sick. Drugs that aren’t listed on the label can include, steroids or estrogens. Products may even contain toxic, or poisonous, substances. Examples include, as arsenic, mercury, lead, and pesticides. Supplements must be recalled if they are found to contain toxic ingredients.
Mental stress increases the excretion and hence the need for many nutrients. Among the most important are magnesium and vitamin C, both of which are used by the body in larger quantities during periods of physical and mental stress. [24,25] Compared with our past as hunters and gatherers, today´s stress is often of a more permanent nature. Instead of experiencing occasional situations where we had to fight or flee, many of us live with recurring stress day in and out.
There are thousands of dietary supplements on the market, including 40+ essential nutrients alone and in various combinations, i.e. vitamins, minerals, trace elements and fatty acids. However, a number of other nutrients are "conditionally essential", meaning that the body normally can make these molecules, but some people do not make optimal amounts. Examples are L-carnitine, alpha-lipoic acid, the methyl donor betaine,  chondroitin sulfate, coenzyme Q10, choline, amino acids such as tyrosine or arginine, and "essential" sugars normally formed in the body. 
Most Americans get far more protein than they really need. In theory, that may not be wise. Like carbohydrates, protein provides 4 calories per gram, and excess calories from any source will be stored as body fat. Excess dietary protein increases calcium loss in the urine, perhaps raising the risk for osteoporosis ("thin bones," more a worry for women) and kidney stones (a particular worry for men).
Nutritional supplements are exactly that, supplements to a healthy, nutritious diet. One should not take nutritional supplements in the hope that they will make up for a poor diet and lack of exercise, they will not! There are some nutritional supplements including some vitamins and minerals, as well as other nutrients/cofactors that one can use in conjunction with a healthy diet to promote optimal health. For example, to consume the amount of vitamin E that has been shown to protect the body against free radical damage, one would have to consume a very significant amount of fat calories as vitamin E is found in foods that are high in fat such as vegetable oils, nuts and seeds. it makes sense to take a supplement of vitamin E rather than consuming lots of fat. The same goes for vitamin D. It's very difficult to get vitamin D in your diet as it isn't found in many foods and studies show that most people do not get enough vitamin D.