Researcher says evidence suggests they may, but industry rep disagrees
By Brenda Goodman
WEDNESDAY, July 10 (HealthDay News) -- Artificial sweeteners appear to disturb the body's ability to count calories and, as a result, diet foods and drinks may wind up encouraging weight gain rather than weight loss, an expert contends.
In an opinion piece published July 10 in the journal Trends in Endocrinology and Metabolism, Susan Swithers, a professor of behavioral neuroscience at Purdue University in West Lafayette, Ind., rounded up recent research on artificial sweeteners.
Commonly used sweeteners include sucralose, aspartame and saccharin, among others.
Swithers has been studying the effects of artificial sweeteners on rats, but the journal asked her to look at evidence of health effects in humans too.
Swithers said studies following people who regularly consume diet soft drinks over time have found that those people are at higher risk for weight gain and obesity than people who don't drink sodas at all.
Compared to people who avoid diet or regular soft drinks, diet soda drinkers also appear to have elevated risks for type 2 diabetes, heart disease and metabolic syndrome -- a group of symptoms that puts people at increased risk for those conditions.
What's more, Swithers said, the risks for these health effects seem to be similar in people who drink diet sodas compared to those who drink regular sodas, suggesting that there isn't much benefit in switching.
Some of those studies aren't conclusive, however, because they can't rule out the possibility that people were drinking diet sodas because they were gaining weight, not the other way around -- a problem called reverse causality.
One study of soda-drinking teens found that those assigned to swap regular soda for one diet soda every day gained less weight over the course of 18 months than those who kept drinking sugar-sweetened soda. The study didn't look at what might happen if teens were asked to drink water instead of sweetened beverages, however.
Not everyone agrees with Swithers's assessment of the research.