Final answer:
A BMI greater than 30 kg/m² is classified as obesity, with a BMI of 35 kg/m² indicating severe obesity and a BMI of 40 kg/m² or more, or a BMI ≥ 35 kg/m² with obesity-related health issues, defined as morbid obesity.
Step-by-step explanation:
The classification for a BMI (Body Mass Index) greater than 30 kg/m² is considered obesity. This is based on a measurement of an individual's weight relative to their height and serves as an estimate of body fatness. An adult with a BMI of 30 or higher falls into this category. Specifically, a BMI between 30 and 34.9 kg/m² classifies someone as obese, while a BMI of 35 kg/m² could indicate severe obesity, and a BMI ≥ 40 kg/m² but < 45 kg/m², or a BMI ≥ 35 kg/m² with obesity-related health problems, is categorized as morbid obesity.
It's important to note that while BMI is commonly used, it may not accurately distinguish between fat and muscle mass, and, therefore, it could be less reliable for assessing individuals like athletes. BMI is more useful for studying populations and can be less indicative of health on an individual basis.