Health Information
Body Mass Index (BMI)
Topic Overview
Your Reference body mass index (BMI) Opens New Window and waist size affect your risk of Reference type 2 diabetes Opens New Window, Reference high blood pressure Opens New Window, Reference high cholesterol Opens New Window, and Reference coronary artery disease Opens New Window. The following table shows the risk.
| Classification | BMI | Waist size and relative risk | |
|---|---|---|---|
|
Men: less than 40 in. (102 cm) Women: less than 35 in. (88 cm) |
Men: 40 in. (102 cm) or more Women: 35 in. (88 cm) or more |
||
| Normal | 18.5–24.9 | — | Increased risk |
| Overweight | 25–29.9 | Increased risk | High risk |
| Obesity I | 30–34.9 | High risk | Very high risk |
| Obesity II | 35–39.9 | Very high risk | Very high risk |
| Obesity III (extreme) | 40 or above | Extremely high risk | Extremely high risk |
For Asian people, each risk category may include lower BMIs than those listed in the table.
A BMI under 18.5 is considered unhealthy. There is risk that you are not getting sufficient nutrition (malnutrition). Complications of malnutrition include anemia, nutrient deficiency, heart irregularities, loss of menstrual periods in women (amenorrhea), cavities, and osteoporosis.
This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Reference Terms of Use. Reference How this information was developed to help you make better health decisions.
