Nutrion begins with foods. The study of nutrition involves everything that the body does

with food in order to live, like function, and grow. Foods that are eaten regularly make a diet. Although were you live and how you eat play a major part in your dietary habits, food choices vary from person to person. What people eat affects their health and how they live. Plants make their own food from, water, and air. People can't make their own food but eat plants, and meats to survive. The body's most important need is for energy. To get energy it needs food as a fuel and oxygen to burn it. The amount of energy food produces is called calories. A food calorie, is the amount of heat required to raise the temperature of (2.2 pounds) of water 1 degree Celsius (1.8 degrees Fahrenheit).

The body changes the calories in food into energy, which is very nesscary for the little things like blinking an eye to running a race. Energy is also used for the growing process, for rebuilding damaged cells, and for regulating the body. The number of calories needed each day depends on how much energy your body uses. An active kid can need more calories than an adult who works at a desk. The body needs m

Fats and oils are a concentrated source of energy. Fats in the diet are a must for good health. They make certain types of vitamins available for use in the body, they provide a cushion for vital organs, they make up part of all body cells, and they help to maintain body temperature. Fats also slow aches of hunger because a food mixture containing fat remains longer in the stomach.

In order to live, every cell in the body must be washed in water. Water is needed to carry other nutrients, to regulate body temperature, and to help get rid of waste wastes. Water is about 60 percent of an adult body weight. Water is found in most foods and in most fruits are more than 90 percent water.

The typical diet American diet usually has much more salt than the body needs. People with high blood pressure have to avoid as much salt as possible. Diabetes is another disease that needs careful meal planning. When a person has diabetes the body doesn't normally use of blood sugar. If a person develops diabetes later in life, it usually is controlled with diet alone. Diets high in fat and cholesterol have been connected with blocking the arteries, a common reason in heart disease and stroke. Scientist show that this condition can begin in adolescence or earlier.

Four vitamins A, D, E, and K are called the fat-soluble vitamins. They are digested and absorbed with the help of fats that are in the diet.

If a person consumes more food than required to meet the body's needs, the extra calories become fat . That causes weight gain. Eating too little causes weight loss because the fat is used for energy. One pound of stored fat has almost 3,500 calories. If weight loss is desirable, the best way to lose weight is by eating less of high-calorie foods and getting more exercise.Usually for most people a safe limit for losing weight is 2 pounds a week. Quick and easy weight-loss diets are fads ;because most are unbalanced, puting emphasis on one kind of food and excludeing others. To function, humans must have nutrients. The most important nutrients for people are proteins, carbohydrates, fats and oils, minerals, vitamins, and water. Proteins are made up of amino acids, small units necessary for growth and tissue repair. Protein is the body's most abundant substance except for water and, mayb

Some topics in this essay:
African Asian, Nutrition Nutrion, Dietary Allowances, fats oils, bones teeth, strong bones, main source, body cells, vitamins stored body, wide variety foods, red blood cells, food guide pyramid, strong bones teeth, body calories, body temperature, saturated fats, diets fat, fat-soluble vitamins,