At the basic level, you need to eat enough calories to stay alive. Your basal metabolic rate, or BMR, is the minimum number of calories you need. This number equals the amount of calories your various organs demand to keep going if you’re doing no activity. Think of this number as the energy you’d burn by staying in bed for one day. After all, your body would still pump blood and you’d still be breathing.
By increasing your muscle mass, you’ll also increase your BMR. Muscle demands energy — the more muscle you have, the more energy you need to maintain it. In other words, you’ll burn more calories while you’re at rest if you have much muscle mass.
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