Drink More Diet Soda, Gain More Weight?
Overweight Risk Soars 41% With Each Daily Can of Diet Soft Drink
June 13, 2005 -- People who drink diet soft drinks don't lose weight. In
fact, they gain weight, a new study shows.
The findings come from eight years of data collected by Sharon P. Fowler,
MPH, and colleagues at the University of Texas Health Science Center, San
Antonio. Fowler reported the data at the annual meeting of the American
Diabetes Association in San Diego.
"What didn't surprise us was that total soft drink use was linked to
overweight and obesity," Fowler tells WebMD. "What was surprising was
when we looked at people only drinking diet soft drinks, their risk of obesity
was even higher."
In fact, when the researchers took a closer look at their data, they found
that nearly all the obesity risk from soft drinks came from diet sodas.
"There was a 41% increase in risk of being overweight for every can or
bottle of diet soft drink a person consumes each day," Fowler says.
More Diet Drinks, More Weight Gain
Fowler's team looked at seven to eight years of data on 1,550
Mexican-American and non-Hispanic white Americans aged 25 to 64. Of the 622
study participants who were of normal weight at the beginning of the study,
about a third became overweight or obese.
For regular soft-drink drinkers, the risk of becoming overweight or obese
- 26% for up to 1/2 can each day
- 30.4% for 1/2 to one can each day
- 32.8% for 1 to 2 cans each day
- 47.2% for more than 2 cans each day.
For diet soft-drink drinkers, the risk of becoming overweight or obese
- 36.5% for up to 1/2 can each day
- 37.5% for 1/2 to one can each day
- 54.5% for 1 to 2 cans each day
- 57.1% for more than 2 cans each day.
For each can of diet soft drink consumed each day, a person's risk of
obesity went up 41%.
Diet Soda No Smoking Gun
Fowler is quick to note that a study of this kind does not prove that diet
soda causes obesity. More likely, she says, it shows that something
linked to diet soda drinking is also linked to obesity.
"One possible part of the explanation is that people who see they are
beginning to gain weight may be more likely to switch from regular to diet
soda," Fowler suggests. "But despite their switching, their weight may
continue to grow for other reasons. So diet soft-drink use is a marker for
overweight and obesity."
Why? Nutrition expert Leslie Bonci, MPH, RD, puts it in a nutshell.
"You have to look at what's on your plate, not just what's in your
glass," Bonci tells WebMD.
People often mistake diet drinks for diets, says Bonci, director of sports
nutrition at the University of Pittsburgh Medical Center and nutrition
consultant to college and professional sports teams and to the Pittsburgh
"A lot of people say, 'I am drinking a diet soft drink because that is
better for me. But soft drinks by themselves are not the root of America's
obesity problem," she says. "You can't go into a fast-food restaurant
and say, 'Oh, it's OK because I had diet soda.' If you don't do anything else
but switch to a diet soft drink, you are not going to lose weight."