There is no strict BMI (body mass index) requirement for back liposuction. However, liposuction is ideally recommended for individuals who are not significantly overweight, as it is not a weight-loss solution. Ideal liposuction candidates are typically close to their ideal weight and have fat pockets resistant to diet and exercise. Additionally, it is important to state that liposuction is designed to remove excess subcutaneous fat, not loose skin. If you have excess skin on your back, a backlift or body contouring would be the way to go.