When I had roommates who also had boyfriends, my cat would get fed constantly without my knowledge. When I got him he was still growing, so at first he seemed just like he was growing, then he started getting fat. I was so upset, and had to tell them over and over again not to feed him and not to pour an entire bowl, only what he needs. I bought an electric auto feeder and diet cat food so that they would stop feeding him. I moved out soon after, and he slimmed down. Cats can get diabetes! If you make them fat, you give them all the health problems a human would face.