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Classification of Overweight and Obesity by BMI, Waist Circumference, and Associated Disease Risks




Disease Risk* Relative to Normal Weight and Waist Circumference

BMI
(kg/m2)
Obesity
Class
Men 102 cm (40 in) or less
Women 88 cm (35 in) or less
Men > 102 cm (40 in)
Women > 88 cm (35 in)
Underweight
< 18.5

-
-
Normal
18.5–24.9

-
-
Overweight
25.0–29.9

Increased
High
Obesity
30.0–34.9
I
High
Very High

35.0–39.9
II
Very High
Very High
Extreme Obesity
40.0 +
III
Extremely High
Extremely High

* Disease risk for type 2 diabetes, hypertension, and CVD.
+ Increased waist circumference also can be a marker for increased risk, even in persons of normal weight.

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