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Study suggests nothing can replace moderation in the face of high-calorie food and drinks

By Brenda Goodman

HealthDay Reporter

WEDNESDAY, Nov. 27, 2013 (HealthDay News) -- Hoping to counter all those Thanksgiving calories with extra exercise?

A recent study suggests the strategy may not keep off holiday pounds.

Researchers followed 48 men and 100 women for the six weeks between the Thanksgiving and New Year's celebrations. They ranged between 18 and 65 years of age.

Half reported being serious, regular exercisers. On average, they said, they worked up a sweat almost five hours each week, nearly double the amount of moderate physical activity recommended by the American Heart Association. The other half copped to being couch potatoes.

Researchers weighed and measured each person to calculate their body mass index (BMI) before and after the holidays. They also gauged their percentage of body fat and took their blood pressure.

From mid-November to early January, people in the study gained an average of one-and-a-half pounds. Men gained slightly more, around two pounds each, while women gained a little less, about a pound apiece.

A pound or two may not sound so bad, but studies have found that on average, people gain about two pounds each year. It's called weight creep. And studies have found that once most people put it on, they never take it off.

After 10 years of small annual increases, that's an additional 20 pounds of fat. That means holiday weight gain could be a more important factor in the obesity epidemic than many people realize, said researcher Jamie Cooper, an assistant professor of nutritional sciences at Texas Tech University in Lubbock, Texas.

People who were obese at the start of the study had the biggest increases in weight. They also had significant rise in their percentage of body fat. In fact, starting weight was the best predictor of how much weight and body fat a person might gain.

Exercise had no significant impact on holiday weight gain. Researchers aren't entirely sure why.

On the one hand, Cooper said it could be that the study didn't have enough participants to detect small differences in weight change between exercisers and non-exercisers.

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