This CNN article is not the one I was remembering the other day, but it does say that a virus causes animals to put on more fat when they are injected with it. It is apparently a virus that lots of overweight people have.

I wonder how it works. Does it slow down your metabolism? Or is the fat storage an attempt by your immune system to knock it out?

But not just one virus causes folks to get fat. This article by Discovery is probably the one I was remembering. It says:

At least three viruses may cause humans to gain weight, a finding that could explain why obesity can affect many people in the same region over relatively short periods.

Ah hah. Now we know why Houston is the fat capital of the US.

Now how do I get rid of these viruses? (Virii?)