Drinking seven or more cans of diet soda a week may increase the risk of long-term heart problems. Researchers in China spent four years assessing 200,000 adults in the UK.
Those who drank more than two liters per week of beverages sweetened with artificial sweeteners had a 20% higher risk of developing atrial fibrillation. Independent experts raised reservations about the study, stating that the data is only short-term and observational, meaning the reason for the increase in heart problems is unclear.