What is BMR?

Basal Metabolic Rate (BMR) is the energy expended at rest in a temperate, post-absorptive state (requiring about 12 hours of fasting). Think of it as the energy needed to keep your body running while at complete rest - like an idle car that's still consuming fuel to keep the engine running.

Energy is used to maintain vital organs including the heart, brain, kidneys, nervous system, intestines, liver, lungs, sex organs, muscles, and skin. Approximately 70% of daily calories are used for basic upkeep, 20% for physical activity, and 10% for food digestion (thermogenesis).