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A group of researchers now says that one reason modern women may be packing on the pounds is because they’re not doing the heavy lifting around the house that they once did.

“We looked at 91 different activities — going to the gym, walking the dog — and the only thing that influenced their energy expenditure was the work in the home,” said Edward Archer, a University of South Carolina research fellow and the study’s lead author. “That’s why the study focused on that.”

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“It makes no sense for Coca-Cola to be funding studies on causes of obesity because they are one of the causes for obesity,” said Kelly Brownell, director of the Rudd Center for food policy and obesity at Yale University. “It would be like taking money from the tobacco industry to find other causes of lung cancer. It really makes no sense at all.”