Body mass index, waist size, and risk for disease

Your body mass index (BMI) and waist size affect your risk of type 2 diabetes, high blood pressure, high cholesterol, and coronary artery disease. The following table shows the risk.

Body mass index (BMI) and the risk for diseases
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

Normal18.5–24.9
Overweight25–29.9Increased riskHigh risk
Obesity I30–34.9High riskVery high risk
Obesity II35–39.9Very high riskVery high risk
Obesity III (extreme)40 or aboveExtremely high riskExtremely high risk

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. Being underweight may also result in depression and other mental health conditions.



Author: Caroline Rea, RN, BS, MSLast Updated: April 20, 2007
Medical Review: Caroline S. Rhoads, MD - Internal Medicine
Matthew I. Kim, MD - Endocrinology & Metabolism

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