Present the WHO classification for body mass index (BMI) for categorizing adults into different grades of malnutrition.

The World Health Organization (WHO) classifies adults based on Body Mass Index (BMI) into different grades of malnutrition. BMI is calculated as weight in kilograms divided by the square of height in meters (BMI = weight (kg) / height (m)^2).

The WHO classification for BMI categories in adults is as follows:

1. Underweight: BMI less than 18.5 kg/m^2
2. Normal weight: BMI 18.5 – 24.9 kg/m^2
3. Overweight: BMI 25.0 – 29.9 kg/m^2
4. Obesity (Class I): BMI 30.0 – 34.9 kg/m^2
5. Obesity (Class II): BMI 35.0 – 39.9 kg/m^2
6. Obesity (Class III): BMI 40.0 kg/m^2 or greater

These BMI categories are used to assess nutritional status and identify individuals at risk of health complications related to malnutrition, such as undernutrition (underweight) or overnutrition (overweight and obesity). Proper classification helps in designing appropriate interventions and treatments to address malnutrition and associated health issues.