By Ransdell Pierson and Bill Berkrot WASHINGTON (Reuters) – Diet drinks may increase the risk of heart attacks, stroke and other heart problems in postmenopausal women, according to an informal study that could take some fizz out of enjoyment of the popular beverages. Compared to women who never or seldom consume diet drinks, those who drank two or more a day were 30 percent more likely to suffer a cardiovascular event and 50 percent more likely to die from related disease, researchers found. The findings were gleaned from an analysis of diet drink intake and consequences among almost 60,000 participants in the Women’s Health Initiative, a long-running U.S. observational study of cardiovascular health trends among postmenopausal women. “Our findings are in line with and extend data from previous studies showing an association between diet drinks and metabolic syndrome,” said Dr. Ankur Vyas of the University of Iowa Hospitals and Clinics, lead investigator of the study.