In a lot of science journalism, there is a lot of jumping to conclusions without really digging into the science. This week we saw headlines screaming about how diet soda can help you lose weight! So you should start drinking diet soda to beat those sugar cravings, right?
Not so fast my friend. There are a few things wrong with this study.
- The study only lasted 12 weeks, which is fairly short in terms of weight loss. Quite frankly, I don’t care how much weight you can lose in 3 months, I care how much weight you can lose in 3 years. Speaking of which,
- Several long term findings have contradicted this study, including the San Antonio Heart study, which found that every diet soda per day was linked to a 65% increase in the likelihood of overweight and a 41% chance of obesity over a 7-8 year period, and the Framingham Heart Study, which found that people who drank diet soda were still at risk for metabolic syndrome and high blood sugar.
- The study was funded by the soda industry. Now, not all studies funded by the man produce results that benefit the man, but most do.
Of course, correlation does not equal causation (unless you think the declining divorce rate in Maine caused the drop in margarine consumption nationwide), so associations between diet soda and weight gain don’t mean diet soda causes people to gain weight. But it means we should think about these associations, and what could be influencing them, before throwing a few 12 packs of diet coke in our carts. Because chemistry and biology aren’t the only things influencing weight gain, a lot of it is psychological and even economic (I addressed this a little bit in an earlier post on high fructose corn syrup). For example, some people swap regular soda for diet soda, and figure that justifies an extra cookie after dinner. Other people struggle with emotional eating, and swapping Pepsi for Pepsi One isn’t going to address that problem. On top of all that, diet soda is full of artificial sweeteners of questionable safety (especially in high doses). The point is, there’s a lot more that goes into health and weight loss than swapping one thing for another, and all of these things should be considered.
What are your thoughts on diet soda and the beverage industry’s contribution to the fight against the obesity crisis?*
*The second part of this question brought to you by the fact that I have started reading Salt Sugar Fat and am curious to hear others thoughts on the topic.