"Researchers studied 4,681 men and women over 65, following them over a 10-year period, after excluding anyone who already had diabetes at the start of the project. They used a well-validated questionnaire to measure symptoms of depression each year, and tested all participants at two- to four-year intervals for blood sugar. They also calculated body mass index and noted alcohol intake, smoking status and antidepressant use."

"After controlling for these factors, they found that even a single report of high depressive symptoms was associated with an increase in the incidence of diabetes. Overall, people with the highest scores on the depression questionnaire were roughly 50 percent more likely to develop diabetes than those with the lowest scores. Adjusting for race, sex, smoking status, alcohol intake and body mass index made no difference in the result."

"Mercedes Carnethon, the lead author and an assistant professor of preventive medicine at Northwestern University, said there was no evidence one way or the other on whether treating depression could reduce the risk for diabetes. "People in our study who were on antidepressants didn't have an elevated risk for diabetes," she said. "But we don't know if that's because of
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