Weight loss surgery is only really considered for individuals with a BMI of 35 or above. However, recently due to the positive effect of weight loss on medical conditions such as diabetes, doctors have started considering performing surgery at a lower level of BMI. Gastric bands in particular are fully reversible with a relatively low surgical risk, which has prompted the Food and Drug Agency in the US to approve their use starting at a BMI 30. It is always best to consult a weight loss surgeon to address your needs and choose a weight loss operation which is suitable to your circumstances.