Bariatric surgical procedures cause fat loss by a mixture of gastric restriction and malabsorption, or with limiting the quantity of food the stomach can hold, causing malabsorption of nutriments. Hormonal changes are also frequently caused by Bariatric processes. Most weight loss surgeries in Tijuana Mexico now are performed using minimally invasive techniques (laparoscopic surgery). The most frequent bariatric surgery processes are sleeve gastrectomy, gastric bypass, adjustable gastric band, and biliopancreatic diversion with duodenal switch. Each operation has its pros and cons.