Comprehensive Guide: Body Mass Index (BMI) & Metabolic Health
Body Mass Index (BMI) is an internationally recognized epidemiological screening metric established by Belgian mathematician Adolphe Quetelet. It provides a standardized ratio of body mass relative to square height, helping clinicians evaluate risks of cardiovascular disease, type 2 diabetes, and hypertension.
How BMR & TDEE Guide Weight Management
While BMI categorizes body composition relative to population standards, managing weight requires understanding your thermodynamic energy expenditure:
- Basal Metabolic Rate (BMR): Calculated using the clinical Mifflin-St Jeor equation, representing calories burned by your brain, liver, heart, and cellular metabolism while resting.
- Total Daily Energy Expenditure (TDEE): Total calories burned factoring in thermic effect of food (TEF) and physical training. Consuming 500 kcal under TDEE yields a safe, sustainable fat loss of approximately 1 pound (0.45 kg) per week.
Frequently Asked Questions (FAQ)
According to WHO standards, a BMI between 18.5 and 24.9 is classified as Normal/Healthy weight. Under 18.5 is Underweight, 25.0 to 29.9 is Overweight, and 30.0 or higher is classified as Obese.
Metric formula: BMI = weight (kg) ÷ [height (m)]². Imperial formula: BMI = [weight (lbs) ÷ height (inches)²] × 703.
BMR is the baseline calories burned at rest to support vital organs. TDEE is BMR multiplied by your physical activity factor, representing maintenance calories.
No. All calculations run privately in your local browser sandbox. None of your age, weight, or personal health metrics are sent to any remote server.