There are people out there who know that soda is bad for them. They love it though. They reason that if they aren’t drinking soda every day or limiting their consumption to one can each day, they’re limiting the harmful effects that are associated with it. Even better, they think, if they’re only drinking diet soda. After all, it’s a diet product. It contains less sugar and no calories. If there aren’t any calories in diet soda, it can’t be associated with obesity the way that sugary drinks have been.
FoodFacts.com would agree that this is a seemingly logical thought process. We have to remind ourselves, though, that we’re applying a seemingly logical thought process to a chemical concoction with zero nutritional benefits. Logic may, as they say, fly right out the window. There’s a study out that seems to open that window up for all of us.
Researchers examined data taken periodically for nearly 10 years from 749 Mexican-Americans and European-Americans ages 65 and older in the San Antonio Longitudinal Study of Aging (known by the fine acronym SALSA).
They determined that daily and occasional diet soda drinkers gained nearly three times as much belly fat as non-drinkers, after they ruled out other factors such as age, exercise and smoking. The diet soda drinkers added an average of 2.11 centimeters (.83 inches) to their waist circumferences, while the non-drinkers added .77 centimeters (.3 inches). Daily consumers gained a striking 3.04 centimeters (1.19 inches).
Men, European Americans, people with a body mass index greater than 30 and people who did not have diabetes fared the worst.
You don’t want belly fat (visceral fat in technical terms), especially as you reach your later years, when it is associated with greater incidence of mortality, cardiovascular disease, Type 2 diabetes and insulin resistance. High waist circumference is also one component of metabolic syndrome, a cluster of risk factors that also includes high triglycerides, blood pressure and blood glucose.
“This is a more vulnerable population,” Sharon Fowler, an adjunct assistant professor in the Department of Medicine at the University of Texas Health Science Center in San Antonio and lead author of the study said in an interview. According to one study, about a fifth of the U.S. population consumed some form of diet drink on any given day in 2009-2010, and 11 percent of those people drank 16 ounces or more.
A couple of caveats here that are worth mentioning: There is considerable debate over the impact of diet soda and artificial sweeteners, with various studies showing conflicting results. (Another Fowler study in 2008 showed significant increases in body mass index among diet soda drinkers.)
This study, because of the way it was designed, could not prove cause and effect; it showed an association between drinking diet soda and increases in waist circumference. Most strangely, the data revealed no relationship between consumption of regular, sugary soda and waist circumference growth, which Fowler acknowledged would have been expected.
In a statement, the American Beverage Association, said that “previous research, including human clinical trials, supports that diet beverages are an effective tool as part of an overall weight management plan. Numerous studies have repeatedly demonstrated the benefits of diet beverages – as well as low calorie sweeteners, which are in thousands of foods and beverages – in helping to reduce calorie intake.”
The Calorie Control Council, which represents producers of no- and low-calorie foods and beverages, also urged that the study “be treated with caution” due to some limitations. The organization noted that older people tend to lose muscle mass and gain waist circumference as a result of aging and contended that some important information on Mexican-American lifestyles, diet records and family histories were not available to the researchers.
Nevertheless, she said, there are a number of possible explanations for the findings. A psychological one may be that regular diet soda drinkers conclude (as I have) that they are saving calories by not consuming sugary drinks and let themselves go overboard on other foods.
“There can be underestimation of the impact of other foods,” she said. “People can give themselves extra permission to eat. They also can just do bad calorie math.”
Based on other research, she said, the sweeteners and/or the acid in diet soda may have an impact on gut bacteria, the ability to handle sugar from other food and drink or the part of the brain that signals us to stop eating.
With so much uncertain, Fowler said, a safe path is to drink water, milk, 100 percent fruit juice, tea and coffee – perhaps adding a tiny bit of sugar or fruit juice for added sweetness in some.
Personally, most diet soda drinkers we know aren’t drinking it in order to give themselves permission to eat more food. Many don’t like the flavor of sugared sodas. Others feel like the zero calorie count fits into their already existing dietary plan. Most aren’t thinking that a savings of a few hundred calories opens them up to increasing their food consumption. We’re more likely to agree with the acids in diet soda or the artificial sweeteners having an impact on gut bacteria. That makes more sense from our perspective, especially when it comes to the chemical profile of diet soda.
We know sometimes that iced cold, bubbly diet soda would hit the spot. We also know that you can make a better decision in the moment. Iced cold water or iced tea will quench your thirst without chemicals — or belly fat.