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The word "fat" has several meanings, and its relationship to health is often misunderstood. Many people feel that fat - whether body size, type of food, or nutrient - is something to be avoided at all costs.

But fat is an essential part of the diet, necessary to the health of people of all ages, and a principal source of energy.

In recognition of the body's need for fat, the U.S. Department of Agriculture has added to the Basic Four Food Groups a fifth group, which includes fats.