An article a journal from The BMJ says that obesity "cannot be outrun by exercise." It suggests that bad diets are the reason for obesity, not a lack of exercise.

The authors say that even the amount of exercise athletes do, cannot counteract a bad diet. They show evidence that while obesity has rapidly increased in the past 30 years, "there has been little change in physical activity levels in the western population."

It's excess carbohydrates and sugar, not physical inactivity, that are to blame for the obesity epidemic, according to the editorial.

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