The gastric bypass surgery consists of two fundamental parts:

1. Create a smaller stomach: The patient eats what fits in a dessert plate. (The residual stomach is left to perform its endocrine functions)
2. A Bypass of the intestine is performed: The food is not absorbed until it has made a journey of 100 to 200 cm, depending on patients.
3. The Gastric Bypass, is the most used obesity intervention and with more than 25 years of history, on which all other operations are compared.
4. It is the most contrasted operation in terms of long-term results. Until now it was the operation with malabsorption, which presents fewer complications in the long term.
5. Gastric Bypass patients have an excellent quality of life, and can make a totally normal life, without restrictions.

• Good quality of life in that you can eat everything, and do not suffer from flatulence or diarrhea as in the minigastricbypass or duodenal cross.
• The patient has to do less of his part.
• Good control of hunger (due to the reduction of Ghrelin).
• Successful safer treatment and greater weight loss.
• Highly contrasted and effective procedure in the long term (more than 25 years of evolution of the operation).

• The maximum known time of this operation worldwide is 10 years.
• Patients maintain weight loss throughout this time. With this time it is considered as definitive.
• If the patient makes continuous dietary abuses, over the years part of the lost weight can be recovered.
• In the few cases of weight recovery, it can be transformed into Gastric Bypass, by laparoscopy and with 24 hours of admission..