Researchers have discovered new evidence for an illness they have called "infectobesity" -- obesity that is transmitted from person to person, much like an infection. The agent thought to be responsible is a strain of adenovirus, versions of which cause the common cold. It has already been labelled the "fat bug". [...]
Children carrying the virus weighed on average almost 50lb more than those who were not. Among the obese children, who accounted for half the total, those with the virus weighed on average 35lb more than the rest. [...]
Laboratory studies showed the virus infects immature fat cells, prompting them to proliferate and grow more quickly.
Western surge in obesity may have been caused by a virus