Nutrition is defined as "the science of how the body utilizes food to meet requirements for development, growth, repair, and maintenance." There are six classes of nutrients found in foods: carbohydrates, fats, proteins, vitamins, minerals, and water. The first three are energy-producing nutrients; that is, they provide calories and enable the body to generate energy for carrying on its many functions. Although the latter three do not provide energy, they facilitate a variety of activities in the body.
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