What is BMI?

Body Mass Index (BMI) is an accepted measurement of health risk by calculating your weight relative to your height. For adults, BMI over 25 indicates overweight, and BMI over 30 indicates obesity. The BMI is used because, for most people, it correlates with the amount of fat in their bodies. It's not relevant for very muscular people, and doesn't necessarily correlate with health: you may be 'thin' but be frail, and that's why it's not used for frail elderly. Pediatritians use a unique BMI chart to assess children's weight status relative to their development. http://www.nhlbi.nih.gov/guidelines/obesity/BMI/bmicalc.htm