Hi and welcome :) my demon (who is about 10 days younger than Peter's rascals) has dry RC Maine Coon down all the time (he had the kitten one when he was younger) and gets 2 sachets of Whiskas in the morning and 1/2 a tin of Bozita in the afternoon. He just eats what he wants, when he wants and he's not at all podgy.
And show us some pics :D XxX