Weight loss surgery has been studied for approximately 20 years. Early complications are directly related to the operative procedure. These include but are not limited to infection, bleeding, and intestinal leakage. In all reported problems, the long-term risks of morbid obesity far outweigh the risks of the surgery.
The mortality risk rate for an obese person is 1-2% per year, compared to the actual risk of having Bariatric surgery, which averages from .05% (Adjustable Gastric Band) to .5% (Roux-en-Y Gastric Bypass).
That means there is a higher risk for someone who does not get the surgery than the one who does.