What are food, calories and nutrients?
Food is one of the basic necessities of life, it is any substance consumed to provide nutritional support for an organism.
Food contains nutrients, which are 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.
A food staple is a food that makes up the dominant part of a population's diet. It varies from place to place, depending on the food sources available, is eaten regularly—even daily—and ideally should supply a major proportion of a person's energy and nutritional needs.
The energy in food is measured in units called calories.
Scientists divide nutrients into major groups:
carbohydrates
fats
proteins
minerals
vitamins
water.
Most foods contain all or most nutrient groups, in different amounts.
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