http://www.bloomberg.com/news/2010-09-20/children-exposed-to-virus-weigh-more-in-possible-obesity-link-study-finds.html

"Obese children who were found to have been exposed to a strain called adenovirus 36 weighed about 35 pounds more on average than obese children who tested negative, researchers said today in the journal Pediatrics. Children, whether obese or not, who tested positive were 52 pounds heavier on average than those showing no evidence of the virus, according to the study of 124 kids, including 67 who were obese."