Obesity is classified based on Body Mass Index (BMI), which is a calculated value derived from a person's weight and height. The BMI categories for adults, as defined by the World Health Organization (WHO), are as follows: 1. **Underweight**: BMI less than 18.5 2. **Normal weight**: BMI 18.5 - 24.9 3. **Overweight**: BMI 25 - 29.9 4. **Obesity**: - **Class 1 (Moderate obesity)**: BMI 30 - 34.9 - **Class 2 (Severe obesity)**: BMI 35 - 39.9 - **Class 3 (Very severe or morbid obesity)**: BMI 40 or greater These categories provide a framework for assessing weight status and potential health risks associated with obesity. Note that BMI is a screening tool and does not directly measure body fat or account for other factors such as muscle mass, fat distribution, and overall health.

Ranges of obesity

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Obesity is classified based on Body Mass Index (BMI), which is a calculated value derived from a person's weight and height. The BMI categories for adults, as defined by the World Health Organization (WHO), are as follows:

Underweight: BMI less than 18.5
Normal weight: BMI 18.5 - 24.9
Overweight: BMI 25 - 29.9
Obesity:
- Class 1 (Moderate obesity): BMI 30 - 34.9
- Class 2 (Severe obesity): BMI 35 - 39.9
- Class 3 (Very severe or morbid obesity): BMI 40 or greater

These categories provide a framework for assessing weight status and potential health risks associated with obesity. Note that BMI is a screening tool and does not directly measure body fat or account for other factors such as muscle mass, fat distribution, and overall health.