Gastric bypass surgery can help diabetes but doesn’t cure it
Washington: For some people, diabetes may go away after gastric bypass surgery even before they lose much weight.
But it doesn’t “cure” diabetes, according to the largest community-based study of long-term diabetes outcomes after bariatric surgery.
For most people in the study, diabetes either never remitted after gastric surgery or relapsed within five years.
Among the two thirds of the study’s patients whose diabetes at first went away, more than a third re-developed diabetes again within five years after gastric surgery.
After adding in the one quarter of patients whose diabetes never remitted after surgery, most (56 percent) of the study’s patients had no long-lasting remission of their diabetes following gastric surgery. However, when diabetes did go away, the research team extrapolated, it stayed away for a median of eight years.
Which kinds of obese people with type 2 diabetes are likely to get the most benefit from gastric surgery?
“Our results suggest that, after gastric surgery, diabetes stays away for longer in those people whose diabetes was less severe and at an earlier stage at the time of surgery,” said principal investigator David E. Arterburn, MD, MPH, a general internist and associate investigator at Group Health Research Institute.
“Gastric surgery isn’t for everyone. But this evidence suggests that, once you have diabetes and are severely obese, you should strongly consider it, even though it doesn’t seem to be a cure for most patients,” he said.
The multi-site study tracked 4,434 adults at Kaiser Permanente Northern California, Kaiser Permanente Southern California, and HealthPartners for 14 years: from 1995 to 2008. The research arms of all three of these integrated health care delivery systems—and Group Health Research Institute, where the study’s results were analyzed—belong to the HMO Research Network.
The patients had type 2 diabetes that was either controlled with medication or else uncontrolled, and they were also obese enough to be candidates for gastric bypass surgery.
“Our study is the first major evidence that diabetes often recurs after gastric bypass surgery,” Dr. Arterburn said.
Still, he added, even after diabetes comes back, having had a long period of post-surgery remission is likely to have many positive effects, such as fewer complications of diabetes: less damage to eyes and kidneys, and fewer heart attacks, strokes, and deaths.
It’s still not clear whether diabetes relapse happens because of gaining weight back or because of underlying the progression of diabetes. But patients’ weight—before and after surgery—was not strongly correlated with remission or relapse of diabetes in this population.
The study was e-published in advance of print in Obesity Surgery.
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