There are several different types of surgery that shorten and/or reduce resorption length of the digestive tract. Their goal is to decrease the amount and usage of food in the body.
Dr Kisser will also happily advise you about non-surgical weight loss options.
Choosing a surgery is an individual decision. It also strongly depends on eating habits, original BMI and desired result, narcotic risk, for women: the wish of bearing children, and existing illnesses such as diabetes mellitus type 2 or reflux.