It's breeding season and that's likely what he's thinking about. I would also think about making his meals smaller so he's more apt to eat every 7-10 days or so.

How old is he? Adult males don't need a whole lot of food to maintain. They need to be lean and muscular. Fat males don't breed well at all and are lazy(if that is what he will be used for eventually). My adult males range from 900g to 1300g, my oldest being an '02.