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Table 1 World Health Organization Body Mass Index (BMI) classification for adults

From: The effect of protein supplementation on body muscle mass and fat mass in post-bariatric surgery: a randomized controlled trial (RCT) study protocol

 

Principal cut-off points

Additional cut-off points

Underweight

<18.50

<18.50

 Severe thinness

<16.00

<16.00

 Moderate thinness

16.00–16.99

16.00–16.99

 Mild thinness

17.00–18.49

17.00–18.49

Normal range

18.50–24.99

18.50–22.99

23.00–24.99

Overweight

≥25.00

≥25.00

 Pre-obese

25.00–29.99

25.00–27.49

27.50–29.99

Obese

≥30.00

≥30.00

 Obese class I

30.00–34.99

30.00–32.49

32.50–34.99

 Obese class II

35.00–39.99

35.00–37.49

37.50–39.99

 Obese class III

≥40.00

≥40.00

  1. Source: Adapted from WHO, 1995, WHO, 2000 and WHO 2004