For anyone who likes their diet soda, a new study may cause you to pause on slurping down your favorite drink.  An analysis of more than 4,000 participants in the Framingham Heart Study Offspring cohort, found that those who drank at least one artificially sweetened beverage a day were almost three times more likely to develop ischemic stroke and 2.9 times more likely to develop Alzheimer’s disease over the course of 10 years than those who drank artificially sweetened beverages less than once a week.