Basal metabolic rate (BMR) is the rate at which your body burns calories just to sustain life. For most people, that's roughly 50 to 80 calories per hour, or 1,200 to 1,920 calories per day. Exactly what your BMR is depends on genetics, your muscle mass, and other factors.
Of course, you burn more calories when you exercise -- or just go about the activities of daily life. For example, if you work out at the gym for 60 minutes and burn 400 calories, that comes in addition to whatever your BMR burns up. (If you walk home from the gym instead of driving, you'll burn even more!) At the end of the day, if your total energy expenditure is greater than the number of calories you've eaten, you'll lose weight.
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