What BMI classification indicates extreme risk?

The classification that indicates extreme risk is associated with a BMI of 40.0 kg/m² and above. This threshold signifies a level of obesity where individuals are at significantly greater risk for various health complications. These can include cardiovascular diseases, type 2 diabetes, hypertension, and certain types of cancer. The body mass index (BMI) is a useful indicator for assessing overweight and obesity within a population, helping to identify individuals who may benefit from medical interventions or lifestyle changes.

In this context, the other classifications represent lower ranges of BMI. A BMI between 30.0-34.9 kg/m² indicates Class I obesity, which carries an increased risk but not as significantly as Class III obesity, which starts at 40.0 kg/m². Similarly, a BMI of 35.0-39.9 kg/m², classified as Class II obesity, suggests a higher risk than Class I, yet still not reaching the extreme risk levels seen in Class III. A BMI of 25.0-29.9 kg/m² is classified as overweight and does not indicate obesity-related extreme health risks. Therefore, a BMI of 40.0 kg/m² and above is the critical cutoff that denotes extreme risk.