A calorie is a unit of heat used to express the energy-producing content of foods. Your dietitian will determine how many calories you need every day, and how they should be divided among types of food, by considering your height, weight, age, activity level, growth needs, metabolism, and general life style. For example, an active young person of normal weight needs more calories than an inactive older person or an overweight person.

Remember, if you eat more calories than you need to produce energy, the excess calories are stored as body fat.

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