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Food is one of the basic necessities of life. Food contains nutrients—substances essential for the growth, repair, and maintenance of body tissues and for the regulation of vital processes. Nutrients provide the energy our bodies need to function. The energy in food is measured in units called calories.
Scientists divide nutrients into six major groups: carbohydrates, fats, proteins, minerals, vitamins, and water. Most foods contain all or most nutrient groups, in different amounts.
Carbohydrates provide energy for the body. Nearly all the carbohydrates we eat come from plants. They include starches found in cereal grains and plants like potatoes and yams. Sugars, found in fruits, vegetables, and milk, are also carbohydrates. Sugarcane and sugar beets are grown specifically for their high sugar content.
