If drug treatments have already failed and/or are not an acceptable alternative (for example, if you are an established addict or have heart failure), GI tract surgery is still probably a very bad idea at your age.

Instead, why not see an orthodontist and get your jaw wired shut? Its a hell of a lot less embarrassing than the absolutely *raunchy* farts that GI tract surgery almost always produces, its easily reversible in a single office visit, and in cases like yours, is proven to produce results in helping a patient stick to a diet; by eliminating most of the pleasurable aspects of eating (chewing, eating in public, etc) you will quickly find yourself only consuming sustenance when you really need it.