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Besoins et composition corporelle

Body Mass Index (BMI)

Ratio of weight/height² used to estimate weight appropriateness.

Definition

BMI is an indicator evaluating the ratio between weight and height of a person. It is calculated by dividing weight (in kg) by height squared (in m²).

How it works

BMI is widely used in medical and nutritional fields to detect risks of overweight or underweight. Although practical and easy to calculate, it has limitations as it does not distinguish between muscle mass and body fat. For example, a muscular athlete may have an elevated BMI without excess body fat.

Role

BMI helps identify weight-related health risks and guide nutritional recommendations.

Examples

  • BMI of 22 for a 70 kg, 1.78 m person
  • BMI of 28 indicating overweight
  • BMI of 32 revealing obesity

Recommendations

Use BMI as an initial screening tool, but complement it with other measures like waist circumference or body composition analysis. A healthcare professional can better interpret your BMI in context.

Key takeaway

BMI is a practical but incomplete indicator requiring interpretation with other bodily data.

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