Body mass index:A key index for relating weight to height. Abbreviated BMI. BMI is a person's weight in kilograms (kg) divided by his or her height in meters squared. TheNational Institutes of Health(NIH) now defines normal weight,overweight, andobesityaccording to BMI rather than the traditional height/weight charts.
- Overweight is a BMI of 27.3 or more for women and 27.8 or more for men.
- Obesity is a BMI of 30 or more for either sex (about 30 pounds overweight).
- A very肌肉发达的person might have a high BMI without health risks.
