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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