If your Body Mass Index (BMI) is above 35 and you have at least one or two diseases such as hypertension, coronary heart disease, type 2 diabetes, insulin resistance, osteoarthritis (rheumatism), sleep apnoea syndrome, fatty liver, etc. If your Body Mass Index (BMI) is directly above 40, and your age is between 18 and 65 and there is no obstacle to undergo general anaesthesia, then you are eligible for this operation.