Research definitions of various weight classes [1]:
- Class III (severe) Obesity BMI > 40
- Class II Obesity BMI 35-40
- Class I Obesity: BMI 30-35
- Overweight: BMI 25-30 (some evidence that this might be protective)
- Normal Weight: 18.5 - 25
- Under Weight: < 18.5
Please note that this dataset has historically been created by evaluating white males. There is good evidence that it a) may be pretty irrelevant entirely when talking about individuals rather than populations, and b) may be pretty well flawed for people who are not white males.
** Unfortunately I don't know the source of the original image.
