What are the differences between overweight, obese and morbidly obese?

BMI is key. Overweight is a bmi over 25. (about 20-25 pounds overweight). Obesity is a bmi from 30-35. This is roughly 30-60 pounds overweight. Morbid obesity is a bmi over 35 (roughly 70 or more pounds overweight).
Bigger & Bigger BMI. The categories overweight, obese, & morbidly obese are defined by the body mass index (bmi), which is a measurement that looks at one's weight in comparison to his height. Tall people are allowed to weigh more than short people are. Bmi calculators are available at the doctor's office and also online. An adult with a BMI of 25-29.9 is overweight, 30-39.9 is obese, and 40 or more is morbidly obese.