Are Diet Sodas Making Me Fat?

You’re probably thinking of a new study that got a lot of press (surprisingly so, since it was a very small study, and it was done on rats). The study found that 8 rats consuming saccharin-sweetened yogurt ate more food overall and put on more weight during a two-week period than 9 rats consuming sugar-sweetened yogurt.

What does this study mean as far as humans are concerned? “Nothing,” asserts Dr. Jay Kenney, Nutrition Research Specialist at the Pritikin Longevity Center. “The study was too small to be sure the results were anything more than a statistical quirk. And even if the results can be repeated, the implication for humans is what?”

What numerous studies on humans over the past several decades have found is the following:

1. Saccharin or other artificial sweeteners have little or no impact on weight.
2. Beverages full of sugar, like regular sodas, have a major impact. “Sugar-sweetened beverages increase overall calorie intake in both rats and humans and promote obesity,” sums up Dr. Kenney.
3. Adding sugar to yogurt and other foods increases the calorie density (but saccharin does not), “and we know that increased calorie density is the single most important dietary factor predicting increased ad libitum [eat till you’re satisfied] calorie intake in rats and people,” adds Dr. Kenney. Put simply, the more calorie-dense foods we eat, the more calories we take in, and the fatter we get.

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