What is Basal Metabolic Rate (BMR)?
Basal Metabolic Rate (BMR) is the minimum number of calories your body requires to perform its most essential, life-sustaining functions while at complete rest. These functions include breathing, circulating blood, regulating body temperature, cell production, nutrient processing, and maintaining brain activity.
Essentially, if you were to stay in bed all day without moving a single muscle, your body would still burn calories equal to your BMR. BMR accounts for approximately 60% to 75% of your Total Daily Energy Expenditure (TDEE), depending on your age, muscle mass, and level of physical activity.
How to Use BMR for Weight Management
To lose, gain, or maintain weight, your BMR is the baseline starting point. By multiplying your BMR by an activity factor, you determine your Total Daily Energy Expenditure (TDEE).
- Weight Loss: Consume fewer calories than your TDEE (creating a calorie deficit), but avoid eating below your BMR without medical supervision, as this can trigger a survival state, slowing down your metabolism.
- Weight Gain: Consume more calories than your TDEE (creating a calorie surplus), combined with strength training to build muscle mass.