Reuters recently reported on how Johns Hopkins University analyzed data from a U.S. survey of 24,000 people over a period of 10 years related to diet soda and obesity. From the article:

In the study, published in the American Journal of Public Health, overweight drinkers of diet beverages in the United States ate 1,965 in food calories a day compared to 1,874 calories among heavy people who drank regular sugar-sweetened beverages. Among obese diet beverage drinkers, those who consumed low- or no-calorie drinks ate 2,058 calories a day in food versus 1,897 food calories for those who had regular drinks, researchers said.