Dietary Allowances (RDA) are the daily amounts of essential nutrients that will prevent
eat a variety of foods, maintain ideal weight, avoid too much fat, and eat foods with
Agriculture has issued Dietary Guidelines. These guidelines are designed to help
Americans choose the recommended number of daily servings from each of the five
Label is made to help you buy foods that will meet the Dietary Guidelines. Most
processed foods now carry nutrition information.
body cannot make them and has to get them from food. Energy needs vary by age. Adults
trying to lose weight will eat less food and have problems meeting their nutrient needs.
activities. The pattern of eating is also important. Snacks provide a large amount of
calories for many Americans. Unless nutritious snacks are part of the daily diet, snacking
will cause weight gain. Also binge eating and fasting will add to weight problems.
Maintaining weight in older people is important because they usually lose weight as they
age. Some of that weight is muscle. People need to exercise regularly to maintain muscle,
to feel better and to reduce the risk of falls and broken bones.
and all of them together are needed for overall health. The body uses energy to function
Carbohydrates are the most available foods in the world. Carbohydrates in foods, like
fiber. Dietary fiber, like lettuce, if eaten daily, can decrease the risk of colon cancer. If
there isn’t enough carbohydrates in the body during exercise, the body tires faster.
Research has proven that a daily diet high in carbohydrates is helpful. Most sports
nutritionists recommend a meal high in carbohydrates 3 or 4 hours before an event.
for carbohydrates are grains, potatoes, vegetables, and fruits.
Everyone thinks that fat in the diet is bad, but really the body needs it. Fat provides
energy by giving calories to the body. They are the most concentrated source of energy in
the diet. People need to watch how much fat they eat, not do without it entirely. Because
fat sources have little water in them, they take up less room, so we eat more fat without
getting full. So that’s why it is easy to get fat on a high-fat diet. Obesity increases the risk
people who have high-fat diets. It is also known that breast and uterine cancer are more
common in obese women. Best sources of fat are margarine, vegetable/plant oils, nuts,
meats, cheese, and cream.
body’s protein is located in the muscle tissue. Every cell in the body is partly made of
open sores need protein to heal these wounds. Also, if carbohydrates, starches, or fats are
unavailable, protein can be used to supply energy. Everyone needs some protein
everyday. How much is needed depends on body size, rate of growth, and each persons
healing requirements. The best sources of protein are eggs, milk, fish, meat, poultry, and
Vitamins help your body use carbohydrates, fats, and proteins. In most cases, vitamins
cannot be made by the body and must be taken from food. Vitamins are necessary for
growth, healthy skin, teeth and eyes, and cell formation. They are also important in
poultry, milk, fruit, breads, and cereals. There are 13 known vitamins, 4 fat-soluble and 9
water-soluble vitamins. Fat-soluble vitamins include vitamins A, D, E, and K. The water-
soluble vitamins include vitamin C and the B-vitamin complex.
A lot of people think vitamins can replace food. They cannot. If you eat a variety of
nutritious foods, you shouldn’t need vitamin supplements. Taking more nutrients than your
body needs won’t give you any more energy, but will prevent nutritional deficiency
diseases like scurvy, beriberi, and rickets, although these diseases are rare in the United
States. Taking vitamin and mineral supplements to prevent or give you more protection
against cancer has not been proven effective. It has been found that smoking slightly
increases the body’s need for vitamin C, but not for nutrients over the 100% of the
Recommended Dietary Allowances. High-potency vitamin/mineral combinations could be
dangerous if taken in large amounts. Some side effects are fatigue, diarrhea, and hair loss.
You won’t find water listed on nutrient charts, but everyone knows that we can’t live
without it. While we can survive for long periods of time without many vitamins and
minerals, it takes only a few days without water to lead to death. Water is a colorless
contains no calories. Even tissues that are not thought of as “watery” contain large
is more than one-fifth water. In all, water accounts for about one-half to two-thirds of the
body through the blood and lymphatic systems. Also, it plays an important role in
regulating body temperature; the heat released when we lose water through perspiration
helps keep us cool.
We cannot rely on thirst as the only indicator of water requirements. It is possible to
quench your thirst without putting back into your body the amount of water you need.
That’s the reason you’re advised to drink 6 to 8 glassed of fluid every day, whether you’re
thirsty or not. This recommendation has special meaning for the elderly, they are less
water, since the body is very efficient at getting rid of what it doesn’t need.
Most of the water we drink comes from beverages, including juice, milk, and soft
drinks. Coffee and tea also supply water, but these sources are taken daily and they
increase loss of water through the kidneys. Solid foods also add a lot to our daily water
intake. Most fruits are more than 80 percent water, and even foods that don’t seem juicy
or moist supply us with large amounts of water.
Minerals are necessary for good health and growth. Certain amounts of minerals are
needed to keep our bodies working properly.
The two important body functions that mineral elements do are building and regulating.
The building functions have to do with the skeleton and all soft tissues, including the
blood. The regulating functions include heartbeat, blood clotting, maintenance of blood
Large amounts of some minerals are needed in the diet because they are present in large
magnesium and sulphur are known as macrominerals. More than 100 milligrams of these
minerals are needed everyday. Others, called trace minerals, are needed in small amounts.
mineral elements are considered harmful, such as lead, mercury and cadmium.
Phosphorus helps strengthen bones and teeth and is also a part of every body tissue. It
has more functions than any other mineral element. Antacids can interfere with
phosphorus absorption. If used for a long time antacids could cause severe bone
demineralization. Good sources of phosphorus are meat, fish, poultry and eggs. Fruits and
vegetables are usually low in phosphorus and are not good sources.
and transfer of nerve impulses. Prolonged vomiting and kidney disease will cause
potassium deficiencies. The best sources of potassium are fruits and vegetables.
Sodium is found mainly in the blood and fluids outside body cells. It maintains water
balance inside and outside the cells. The sending of nerve impulses also depends on the
proper amounts of sodium. Doctors will often advise patients to reduce the amount of salt
congestive heart disease. A decrease in salt can reduce water holding, which usually is
associated with these health problems.
Magnesium is important to the normal functioning of nerves and muscles. When there
is not enough magnesium in the body, people could have symptoms like muscle spasms,
weakness, irregular heart beat, and leg cramps. In malnourished people, a lack of
magnesium will cause tremors and convulsions.
the essential ones and what each one does for the body.
Vitamin A: Promotes good eyesight and helps keep the skin and mucous membranes
resistant to infection.
Vitamin B1: (thiamine) – Prevents beriberi. Important to carbohydrate energy and health
of nervous system.
Vitamin B2: (riboflavin) – Protects skin, mouth, eyes, eyelids, and mucous membranes.
Vitamin B6: (pyrido xine) – Important in the regulation of the central nervous system.
Vitamin B12: (cobalamin) – Needed to form red blood cells.
Niacin: Maintains the health of skin, tongue, and digestive system.
Other B Vitamins: biotin, pantothenic acid.
Vitamin C: (ascorbic acid) – Maintains collagen, a protein necessary for the formation of
skin, ligaments, and bones. It helps heal wounds, and mend fractures and aids in resisting
some types of viral and bacterial infections.
Vitamin D: Important for bone development.
Vitamin E: (tocopherol) – Helps protect red blood cells.
Vitamin K: Necessary for formation of prothrombin, which helps blood to clot.
dairy products and eggs, and have excellent health. Vegetarian diets meet with the
Dietary Guidelines and can meet all known nutrient needs. The key to a healthy
vegetarian diet is to eat a wide variety of foods including fruits, plenty of green leafy
vegetables, whole grain products, nuts, and seeds. Because animal products are the only
sources of vitamin B-12, vegetarians must supplement their diet with this vitamin. Also
vegetarian diets, especially for children, need to have the right amount of vitamin D and
calcium, which comes from dairy products.
In the eighteenth century, scientists learned more about how food helped the body
human diet. So much is known about nutrition today it’s hard to believe that 100 years ago
rickets was a common disease for young people, lack of iron for the wealthy, and cavities
35 years. One hundred years ago, it was 40 years. Today, with all our medical advances
knowledge Americans still continue to eat too much food that is too high in fat,
cholesterol, sugar, and salt!