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Indice de masse corporelle IMC BMI

Body mass index (BMI) is a simple index of weight-for-height that is commonly used in classifying overweight and obesity in adult populations and individuals. It is defined as the weight in kilograms divided by the square of the height in meters (kg/m2).


BMI provides the most useful population-level measure of overweight and obesity as it is the same for both sexes and for all ages of adults. However, it should be considered as a rough guide because it may not correspond to the same degree of fatness in different individuals.



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The World Health Organization (WHO) defines "overweight" as a BMI equal to or more than 25, and "obesity" as a BMI equal to or more than 30.

These cut-off points provide a benchmark for individual assessment, but there is evidence that risk of chronic disease (such as:
diabetes, heart disease, high blood pressure, gallbladder disease, etc) in populations increases progressively from a BMI of 21.

Underweight (BMI lower than 18,5) increases the risk of osteoporosis, undernutrition and eating disorders.