What Is BMI?

Body Mass Index (BMI) is a number calculated from a person's weight and height. BMI is a fairly reliable indicator of body fatness for most people. BMI does not measure body fat directly, but research has shown that BMI correlates to direct measures of body fat. Calculating BMI is one of the best methods for population assessment of the overweight and obese. Because calculation requires only height and weight, it is inexpensive and easy to use for clinicians and the general public. The use of BMI allows people to compare their own weight status to that of the general population.

It is important to remember that weight is only one factor related to risk for disease. If you have questions or concerns about the appropriateness of your weight, you should discuss them with your healthcare provider.

The BMI ranges are based on the relationship between body weight and disease and death. Overweight and obese individuals are at increased risk for many diseases and health conditions, including the following:

• Hypertension
• Dyslipidemia (high cholesterol, low HDL cholesterol, or high levels of triglycerides)
• Type 2 diabetes
• Stroke
• Gallbladder disease
• Osteoarthritis
• Sleep apnea and respiratory problems
• Some cancers (endometrial, breast and colon)