Evidence is growing in support of a contentious theory that a virus causes weight gain and obesity, but not everyone is convinced. A study shows for the first time that this virus, called adenovirus-36, is more often found in people who are obese than in those of a healthier weight.

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Evidence is growing in support of a contentious theory that a virus causes weight gain and obesity, but not everyone is convinced. A study shows for the first time that this virus, called adenovirus-36, is more often found in people who are obese than in those of a healthier weight.