Calculate food and exercise calories to manage energy balance
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A calorie is a unit of energy. 1 kilocalorie (kcal) = 1000 calories. Food provides energy, exercise burns energy, and the difference determines weight change.
Reference: Adult women need about 1800-2000 kcal daily, adult men need about 2200-2500 kcal. Actual needs vary by age, weight, and activity level.