Getting bariatric surgery will not decrease mortality several years after the surgery, according to a study published in JAMA.

Although the weight-loss surgery has been shown to decrease weight and diminish diabetes, the older, severely obese male patients in the study were not living longer because of the procedure.

The study was to be presented Sunday at the Academy Health Annual Research Meeting.

For the severely obese, bariatric surgery is one of the most effective ways to reduce weight.  The most common bariatric surgery is gastric bypass, which creates a small stomach pouch that restricts food intake.

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