Thread: how much to feed this beast?

New to our maine coon cat...It seems if I try to go by how much the cat food bags Say to feed him, it is just not enough. Does that just not apply to Maine Coon cats?? Just how much ought an 18lb and counting couple yrs old cat eat? (not sure how old he is ....between 2 and 3 the shelter said..but he was so much smaller...too too thin.)