June 29th, 2011

Time Healthland reports:

More bad news, diet soda drinkers: data presented recently at the American Diabetes Association’s (ADA) Scientific Sessions suggest that diet drinks may actually contribute to weight gain and that the artificial sweeteners in them could potentially contribute Type 2 diabetes.

In one study, researchers from the University of Texas, San Antonio, looked at aggregate data from 474 older adults in the San Antonio Longitudinal Study of Aging, or SALSA. At the time of enrollment and at three follow-up exams thereafter, all participants reported their diet soda intake and were measured for height, weight and waist circumference. The researchers wanted to track any association between diet soda drinking and body fat over time.

What they found was that all participants saw their waistlines expand, but those who reported drinking diet soda had 70% greater increases in waistline growth than non-drinkers 9.5 years later. Among frequent drinkers — those who consumed two or more diet sodas a day — waistline growth was 500% greater than among non-drinkers. Researchers said their results were adjusted for other contributing factors like diabetes status, leisure-time physical activity level and age.

The data didn’t say why diet sodas might play a role in weight gain, but previous research suggests it has to do with the disconnect between the taste of artificial sugars and their lack of calories. The brain is wired to expect a big load of calories when foods taste sweet or fatty. But because diet foods fail to deliver, it throws the brain out of whack. Studies in animals suggest that artificial sweetener consumption may lead to even more eating and weight gain, perhaps in part because it triggers the body to start storing more calories as fat.

For the rest of the story, read Time Healthland