BMR equations are population averages with ±10% individual variation. If your actual metabolism seems very different (based on weight trends), your true BMR may differ from the estimate. Track weight at consistent calorie intake for 2–3 weeks to assess actual metabolic rate.

BMR (Basal Metabolic Rate) is measured under strict laboratory conditions after 12+ hours of fasting and complete rest. RMR (Resting Metabolic Rate) is measured under less strict conditions and is typically 3–10% higher. For practical purposes, they are often used interchangeably.

Two reasons: (1) A smaller body requires fewer calories to maintain. (2) Adaptive thermogenesis — your body reduces non-essential energy expenditure when it senses calorie restriction. This adaptation can persist even after dieting ends.

Building muscle is the most effective way. Each kg of muscle burns roughly 13 kcal/day at rest vs. 4.5 kcal/day for fat. Adequate protein intake, resistance training, and avoiding crash diets help maintain metabolic rate.

No. BMR is your absolute minimum energy need at rest. Unless completely bedridden, you burn additional calories through daily activities. Eating at BMR while active creates an excessive deficit that can harm muscle mass and metabolism.

Standard BMR equations use total weight and don't distinguish muscle from fat. Very lean, muscular individuals may have higher actual BMR than predicted. Very obese individuals or those with low muscle mass may have lower actual BMR than predicted.