Researchers have found that obesity may actually be very similar to the common cold, as it is a virus that can easily be caught. The study was led by Nikhil Dhurandhar from the Pennington Biomedical Research Center in Baton Rouge, Louisiana. They focused their research on a various known as AD-36, as they believed it played a major role in obesity. When looking at obese people, they found that over 30% of them actually had this highly contagious virus. This compared to only 11% of people who were said to be at a normal weight level. The virus can cause the body to gain weight for months at a time before it can actually fight the bug. The virus gets into the lungs and the rest of the body, causing fat cells to multiply. The belief is that this could be one reason as to why some overweight people experience a sudden gain in weight.