Is it okay to be fat if you're fit?

Research suggests that physical activity may cancel out some of the bad effects of being overweight or obese.

Humanity is getting pudgy, and worse. High-calorie diets and low-activity lifestyles have created a massive "globesity" problem. About 300 million people around the world are now obese (a body mass index [BMI] of 30 or more).

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