I am a member of several Facebook rat pages and it saddens me how many people have obese rats. I understand that males are larger, but some of these guys look like they can barely move they are so big. We all talk about URIs, but poor diet and letting your rat get that obese is also slowly killing it. It just frustrates me that no one seems to take it seriously that your rats life span will be shorter because you weren't responsible enough to monitor a healthy diet for them. You are killing them. Ugh.