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Your metabolism is responsible for converting food and drink into energy, according to the National Institutes of Health. Your age, gender and body size all contribute to your unique basal metabolic rate ( BMR). Your BMR is the minimum number of calories your body needs to sustain life while it's in a resting state. This rate accounts for well over 50 percent of the calories you burn each day. A few alterations in diet and lifestyle may help boost your metabolism.