📅 2024-12-31
The starting point of diet and health management, BMR! Learn everything from accurate calculation methods to utilization strategies.
Basal Metabolic Rate (BMR) is the minimum energy expenditure required for sustaining life. Calories used for basic bodily functions like heartbeat, breathing, temperature maintenance. Energy consumed even lying down doing nothing all day, accounting for about 60-70% of total energy expenditure.
Harris-Benedict formula (most widely used): Men = 66.47 + (13.75 × weight kg) + (5.00 × height cm) - (6.76 × age). Women = 655.10 + (9.56 × weight kg) + (1.85 × height cm) - (4.68 × age). Mifflin-St Jeor formula (more accurate): Men = (10 × weight kg) + (6.25 × height cm) - (5 × age) + 5. Women = (10 × weight kg) + (6.25 × height cm) - (5 × age) - 161. Example: 30-year-old man, 75kg, 175cm → about 1,730kcal.
TDEE (Total Daily Energy Expenditure) = BMR × Activity multiplier. Activity multipliers: Sedentary 1.2, Light exercise (1-3 days/week) 1.375, Moderate exercise (3-5 days/week) 1.55, Heavy exercise (6-7 days/week) 1.725, Very heavy exercise (twice daily) 1.9. Example: BMR 1,730 × 1.55 = about 2,681kcal. TDEE is your daily calorie need.
Weight loss: Consume 300-500kcal less than TDEE. Weight maintenance: Consume equal to TDEE. Weight gain (bulking): Consume 300-500kcal more than TDEE. Caution: Consuming below BMR causes metabolic rate decrease, muscle loss, yo-yo effect. Healthy dieting consumes above BMR, below TDEE.
① Strength training: BMR increases with muscle mass (about 13kcal additional burn per 1kg muscle). ② High-Intensity Interval Training (HIIT): Metabolic rate increases after exercise (EPOC effect). ③ Protein intake: Energy burn increases from Thermic Effect of Food (TEF). ④ Adequate sleep: Sleep deprivation causes hormonal imbalance lowering metabolic rate. ⑤ Drink enough water: Water deficiency decreases metabolism. ⑥ Regular meals: Long-term fasting decreases metabolic rate.
Indirect measurement (using formulas): Use formulas like Harris-Benedict, Mifflin-St Jeor. InBody measurement: Body composition analyzer provides BMR (considers muscle mass). Direct measurement: Indirect calorimetry (respiratory gas analysis) at hospital or specialized center. Smartwatch/apps: Activity-based estimation. Most accurate method is direct measurement with professional equipment, but formula calculation is practical for daily use.
Conclusion: Basal metabolic rate is the most important indicator for weight management. Know your BMR and TDEE accurately, adjust calories according to goals. Maintain efficient metabolism by increasing BMR through strength training and healthy lifestyle habits.