Gastric bypass is a weight loss surgery that literally reduces the stomach to the size of a walnut. First, doctors create a tiny pouch at the top of the stomach and seal off the rest. Then, they cut the small intestine in two and attach the lower part to the small pouch. The newly created stomach is so small, it can only hold about six grapes.
Weight loss surgeries have quadrupled in recent years and gastric bypass alone is up 600 percent. Many think it's the magic pill for weight loss, but some experts are now estimating that as many as 30 percent of those people who have the surgery will struggle with new addictions like alcoholism, gambling, compulsive shopping and sex addiction.