Soft Drinks Up Calorie Counts
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
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
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.
"This was a very well done, careful study," Popkin tells WebMD.
"It highlights ... the effects of sugared beverage intake on
Richard Adamson, PhD, a former NIH researcher, now serves as scientific
consultant to The American Beverage Association, the trade group representing
the U.S. soft-drink industry. His take on the Yale study is far different from
that of Popkin.
Adamson says the Yale researchers did not include important studies that do
not implicate soft drinks in obesity. He therefore wonders whether the authors
cherry-picked studies and study data that support a preconceived