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Weight Loss Surgery May Improve or Eliminate Some Diabetes-Related Kidney Problems, Researchers Say

June 21, 2012 (San Diego) -- Weight loss surgery can improve or eliminate diabetes-related kidney disease in obese diabetic people, researchers reported here at the annual meeting of the American Society for Metabolic & Bariatric Surgery.

Poor control of blood sugar increases the risk of kidney disease or damage, known as diabetic nephropathy.

Bariatric surgery had better than expected results on these kidney problems, says researcher Philip R. Schauer, MD, director of advanced laparoscopic and bariatric surgery at Cleveland Clinic, where the study was conducted.

"We expected it to improve or just slow down [the kidney disease]," he tells WebMD. "Surprisingly, a significant percent of patients who had diabetic nephropathy actually had remission."

In the study of 52 patients, over one-third had diabetic nephropathy before the surgery, says researcher Helen M. Heneghan, MD, a bariatric surgery fellow at Cleveland Clinic who presented the findings.

Five years after the surgery, the kidney disease resolved in 58% of these patients, Heneghan says.

In addition, five years after the surgery, 44% of the patients had remission of their diabetes and one-third had improvement, she says.

''This study needs to be validated," Schauer tells WebMD. However, he says the results make sense.

There is now convincing evidence that weight loss surgery can improve blood sugar control in those with diabetes, he says.

"It makes sense if we can control the blood sugar more effectively, we can control kidney problems as well," he says.

Weight Loss Surgery & Kidney Disease: Study Details

The 52 patients had been diagnosed with type 2 diabetes for an average of nearly nine years. Their body mass index or BMI before surgery averaged 49 (a BMI of 30 or more is considered obese).

Most patients had gastric bypass surgery. A surgeon creates a stomach pouch out of a small portion of the stomach and attaches it to the small intestine. A large part of the stomach and some of the small intestine are bypassed.

While 37% had diabetic nephropathy at the study start, the others were also at risk, statistics suggest.

Of the patients who didn't have nephropathy at the start, one-quarter did develop albuminuria, in which too much protein is found in the urine. This reflects kidney disease or other problems.

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