Body Mass Index. BMI is a simple measure of a person's fitness or weight condition. BMI was invented in the 19th century by Adolphe Quetelet. It is defined as an individual's body weight divided by the square of their height. A BMI of 18 to 25 is considered optimal. A BMI under 18 equates to being underweight while over 25 indicates being overweight.
More Health and Fitness
More Health and Fitness
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