Conducted by more than 50 researchers, the study was published Tuesday in the 'Journal of the American Medical Association.' It focused on the health effects of both regular and diet soft drinks on more than 452,000 people in ten countries, between 1992 and 2000. It found that drinking two or more "glasses" of diet soda per day was linked to deaths from circulatory disease, including coronary artery disease. The study also found an association between higher soft drink consumption and risk of death from Parkinson's disease. Research Study, via MarketWatch A study published earlier this year linked regular soft drinks to greater risk of death from cardiovascular disease. Other studies have linked both sugary and artificially sweetened soft drinks to higher risk of Type 2 diabetes and obesity.