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Cause for exaggerated insulin response in subset of bariatric surgery patients identified
Date:3/27/2014

CINCINNATIUniversity of Cincinnati (UC) researchers have discovered that altered islet cell function and reduced insulin clearance contribute to excessive post-meal insulin response in patients experiencing low blood sugar symptoms (hypoglycemia) following gastric bypass surgery.

These findings, led by Marzieh Salehi, MD, associate professor in the UC division of endocrinology, metabolism and diabetes, are featured online this month in The Journal of Clinical Endocrinology & Metabolism, and are part of an ongoing effort by UC researchers to better understand the effect of gastric bypass surgery on glucose metabolism and islet function.

Gastric bypass surgery has been shown to be one of the most effective treatments for obesity, and often improves Type 2 diabetes immediately after surgery and long before any weight loss has occurreda phenomenon that's been attributed to earlier and larger insulin response to meal ingestion.

"For the majority of patients with diabetes, gastric bypass surgery leads to improved glucose control, but a subset of patients develop post-meal hypoglycemiaassociated with too much of an insulin responseseveral years after surgery," says Salehi, also a physician with UC Health.

For this study Salehi and colleagues enrolled 65 subjects who had gastric bypass surgery at least two years prior to enrollment. Participants were stratified based on post-meal symptoms of low blood sugar and studied during meal tolerance tests.

"We have shown that meal ingestion after gastric bypass surgery causes an earlier and larger peak of insulin secretion, and this effect is exaggerated in those with hypoglycemic symptoms following meals," says Salehi, who adds that the effect is particularly exaggerated in those with neuroglycopenic symptoms (cognitive abnormalities, loss of consciousness, and seizure) rather than autonomic symptoms (fast heart beats, sweating, tingling, fatigue).

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Contact: Angela Koenig
angela.koenig@uc.edu
513-558-4625
University of Cincinnati Academic Health Center
Source:Eurekalert

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