Several elements are fundamental : 

	Calculate your BMI

- You sincerely want to loose much weight.
- Your Body Mass Index (BMI) is higher than 40, or 35 with complications of obesity.
- Your obesity is stable.
- You already made modes, which failed. 
- You are between 18 and 60 years old.
- You are ready to modify your food practices.
- You are ready to take again a more constant and regular physical activity.

- An important inflamation of the digestive tract.
- A cardiac, pulmonary or other severe disease making dangerous a general anaesthesia.
- A previous intervention on the stomach
- A not stabilized depression.
- A problem of addiction to alcohol. 

- It is very important to understand that gastroplasty and gastric bypass are not miraculous procedures which will regulate definitively your overweight problem.
- Gastroplasty and Gastric bypass represent an invaluable help to limit your food contributions.
- YOU will lose weight by eating better and by increasing your physical activity.