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“Just for the taste of it” has been the slogan for Diet Coke, the most popular diet beverage on the market, since the 1980s. The idea was to promote a great-tasting drink without all the calories of regular soda. But new research released in June 2011 links diet soda with weight gain and rising blood sugar levels.
Epidemiologists from the School of Medicine at the University of Texas Health Science Center San Antonio presented their work at the recent American Diabetes Association meeting. They found diet soda consumption actually leads to larger waistlines. Another related study in mice showed that aspartame—a prevalent artificial sweetener used in diet sodas—helps raise blood sugar levels in mice predisposed to develop diabetes.
“Data from this and other prospective studies suggest that the promotion of diet sodas and artificial sweeteners as healthy alternatives may be ill-advised,” Helen P. Hazuda, Ph.D., professor and chief of the Division of Clinical Epidemiology in the School of Medicine, said in a statement. “They may be free of calories, but not of consequences.”
The Health Science Center team assessed data from 474 participants in the San Antonio Longitudinal Study of Aging, or SALSA. This large, population-based study is looking at the disablement process in elderly Mexican Americans and European Americans.
Diet soft drink consumers experienced 70 percent greater increases in waist circumference compared to non-users. Frequent users, people who consumed two or more diet sodas per day, experienced a 500 percent greater increase in waist circumference than those of non-users.
Abdominal fat is a major risk factor for chronic conditions like diabetes, cardiovascular disease and cancer.
“These results suggest that, amidst the national drive to reduce consumption of sugar-sweetened drinks, policies that would promote the consumption of diet soft drinks may have unintended deleterious effects,” the authors wrote.
In the other study, scientists examined the relationship between oral exposure to aspartame and fasting glucose and insulin levels in 40 diabetes-prone mice.