I have heard a lot about the body mass index (BMI). What is it and why is it used instead of just weight or percentage of fat?

The body mass index is calculated by dividing your weight in kilograms by your height in meters squared. You may be a candidate for weight loss surgery if you have a BMI of 40 or higher, or if you have a BMI of 35 and also suffer from serious diseases related to obesity, such as diabetes, hypertension, endocrine disorders, cancer, sleep apnea, cardiovascular disease, arthritis, and knee, back and joint problems. More.

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