There are many benefits to weight loss surgery. In my case it drove my diabetes, high blood pressure, GERD, and sleep apnea into remission. But there are other subtle changes to one's health that are less observable.

A study published Thursday in The New England Journal of Medicine found excess weight was linked to eight additional types of cancer— stomach, liver, gall bladder, pancreas, ovary, the brain tumor meningioma, thyroid cancer and multiple myeloma— after reviewing more than 1,000 related studies. So driving down the weight can reduce the risk of cancer in several areas.

"The burden of cancer due to being overweight or obese is more extensive than what has been assumed," Colditz, deputy director for the Institute for Public Health at Washington University School of Medicine in St. Louis, said in a news release. "Many of the newly identified cancers linked to excess weight haven't been on people's radar screens as having a weight component."

http://www.foxnews.com/health/2016/08/25/being-overweight-may-increase-risk-8-cancers.html

Here is another link to this research. It contains a little more data from this study.

http://acsh.org/news/2016/08/25/latest-iarc-report-connects-fatness-with-more-cancers/