Nutrition is the study of nutrients and how the body utilizes the nutrients in food. Nutrition has a great impact on human well-being,behavior, and the environment.
Nutrients are substances needed for growth, maintenance, and repair of the body. The body can make some nutrients if adequate amount of necessary precursors (building blocks) are available.
Essential nutrients are those that a person must obtain through food because the body can not make them in sufficient quantities to meet its needs. The six classes of nutrients are carbohydrates, fat, protein, water, minerals, and vitamins. Carbohydrate, fat and protein provide energy and are called macronutrients. Vitamins and
minerals regulate body process and are called micronutrients. Water is necessary for virtually every body function.
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