Gastric bypass can result in metabolic changes that cause excess insulin production, says Mary-Elizabeth Patti, M.D., F.A.C.P., Director of the Hypoglycemia Clinic at Joslin Diabetes Center. “People secrete more insulin than they should after eating. Glucose levels spike after a meal and then decline too low. This roller coaster pattern of repeated low blood sugars can take a toll on your system.”

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