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it does, from repairing damaged cells to sleeping. A calorie

is a measure of the amount of energy a food can produce. The body changes the calories in food to energy.

the body changes the extra calories into fat. Eating less

food than the body needs will cause a person to lose weight.

depends on how much energy a person's body uses. For

example, an active child usually needs more calories than an adult who works at a desk.

function and maintain itself. These nutrients are proteins, carbohydrates, fats

and oils, minerals, vitamins, and water.

itself. People can get the protein they need from animal

sources such as meat, fish, poultry, and eggs and from plant sources such as beans, peas, nuts, and breads.

Starches and sugars are carbohydrates. Starches are found in foods

such as rice, potatoes, wheat, and corn. Sugars are found in honey and other sweet foods.

of energy that the body can store. The body uses

fats to maintain its temperature and to cushion organs. Fats also make up part of all human body cells and help the body use certain vitamins. Although fats are important to the body, they can also be harmful.

the level of cholesterol in the blood. Cholesterol is a

natural, waxy substance made by the body. It helps to form digestive juices and does other important work. However, when body cells cannot absorb any more cholesterol, the extra begins to build up in the walls of the blood vessels, gradually narrowing them. This condition may lead to a heart attack or stroke.

bones and teeth and helps to clot blood. It can

be found in milk and hard cheese. Another mineral, iron, is needed to build red blood cells and carry oxygen from the lungs to other body cells. Good sources of iron include meat, egg yolks, and dark green vegetables. Other minerals important to the human body are iodine, magnesium, phosphorous, copper, sodium, potassium, and zinc.

and helps the body absorb iron. Vitamin D works with

calcium and phosphorus to make strong bones and teeth. Other vitamins are A, E, K, and the B-complex vitamins.
 

Water also helps the body get rid of wastes and

maintain its temperature. Water makes up about 60 percent of an adult's body weight.

to show how much of different groups of food a

person should eat in order to be healthy. In general they recommend that people eat more grains, vegetables, fruits, and milk and fewer fats and oils.

fruits, dairy products, and meat …