Final answer:
The ranges for BMI are underweight (< 18 kg/m²), normal weight (18-24.9 kg/m²), overweight (25-29.9 kg/m²), obese (> 30 kg/m²), and morbidly obese (> 40 kg/m²).
Step-by-step explanation:
Obesity is defined by the body mass index (BMI), which is a measure of a person's weight in kilograms divided by height in meters squared. The normal, or healthy, BMI range is between 18 and 24.9 kg/m². Overweight is defined as a BMI of 25 to 29.9 kg/m², and obese is considered to be a BMI greater than 30 kg/m². Severe obesity (morbid obesity) is defined as having a BMI over 40 kg/m².