To the best of my reading, 40 bmi tends to be the magic number.  For people with a BMI above 40 to reach a healthier weight and actually maintain it, weight-loss surgery is usually the only option. For a 5’10” man, that’s about 280 pounds, and for 5’5″ woman, approximately 240 pounds.  Certainly possible, but not so common - thanks to #HAES and other FA nonsense.