Body mass index (BMI) is a worldwide renowned tool to assess a healthy weight. It establishes the ratio between height and body weight and determines standards for a healthy body weight, underweight, overweight or obesity.
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|Classification||Results||Risks of illnesses|
|Extreme thinness (underweight)||Less than 16||High|
|Thinness||Less than 18.5||Increased|
|Normal weight||18.5 to 24.9||Weak|
|Overweight||25 to 29.9||Increased|
|Class 1 obesity||30 to 34.9||High|
|Class 2 obesity||35 to 39.9||Very high|
|Class 3 obesity (morbid obesity)||40 and over||Extremely high|
Adapted from: “Lignes directrices canadiennes pour la classification du poids chez les adultes”.