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If you've ever had a doctor tell you that your BMI puts you in the overweight or obese category while you train consistently and feel healthy, you've encountered one of medicine's most persistent measurement failures. BMI — Body Mass Index — is a 19th-century formula designed to analyze population-level weight trends that has been misapplied as an individual health diagnostic for decades. Here's why it systematically misleads physically active men, and what to measure instead.

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The Truth About BMI (Why It Lies to Active Men)

BMI is calculated by dividing body weight in kilograms by height in meters squared. It produces a single number that assigns a person to underweight, normal, overweight, or obese categories. The problem is immediately obvious: this formula has no mechanism to distinguish between muscle tissue and fat tissue.

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A 200-pound man at 10% body fat and a 200-pound man at 30% body fat receive identical BMIs — and entirely different health profiles.

For the general sedentary population with average muscle mass, BMI correlates well enough with body fat percentage to serve as a rough screening tool.

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