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Analysis of 88 Soda Studies Links Soft Drinks to Obesity, Disease

March 8, 2007 – Because they don't eat less, people who get extra "liquid calories" from soft drinks gain extra weight, an analysis of 88 soda studies suggests.

The finding comes from researchers at the Rudd Center for Food Policy and Obesity at Yale University. Study co-author Marlene B. Schwartz, PhD, is research director of the Rudd Center.

"We found quite a clear association between soft-drink intake and taking in more calories," Schwartz tells WebMD. "The most compelling studies showed that, on days when people drink soft drinks, they consumed more calories than on the days when they did not have soft drinks."

Why? Schwartz says the simplest explanation is that people don't compensate for the extra calories in sodas. A person who has a hamburger and a soda, for example, doesn't eat less of his or her hamburger -- or fewer fries -- than a person who washes the burger down with water.

Some studies suggested that the fattening effects of soft drinks go beyond mere calorie counts.

"Sometimes, in fact, people who regularly drank soft drinks ate even more," Schwartz says. "The number of additional calories they took in was more than the calories in their soft drinks. It is almost as if sodas led to greater calorie intake because people get calibrated to a certain level of sweetness."

The Yale team looked at 88 different studies of nutrition and soft drinks. They then used a statistical technique for comparing the effects of soda drinking across all of the studies.

Since diets differ widely, it's hard to identify any single dietary factor that has even a small effect on health. Yet the Yale study shows that soft drinks have a "moderate" effect on calorie intake.

"If you are going to pick one change to make in your diet, and you drink sugared soft drinks, that would be a great place start," Schwartz says.

The study appears in the April 2007 issue of the American Journal of Public Health.

Soft Drinks Just Another Food Choice?

Barry M. Popkin, PhD, director of the obesity program at the University of North Carolina at Chapel Hill, was not involved in the Yale study. His own research suggests that soft-drink intake contributes to obesity.

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