Definition: BMI refers to Body Mass Index, and the American Academy of Pediatrics recommends all children have their BMI tested by their pediatricians. BMI is a mathematical formula that expresses height-to-weight ratio. Measured in kilograms, the person's body weight is divided by the square of his height in meters. Desirable BMI levels vary with age and circumstance.
What is BMI?
By Robin McClure, About.com
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