Should I give my BP's a week off from food?

They've been eating consistently and are currently on weaned rats every 7 days. They seem to be getting a bit bloated/chubby and I was wondering should I give them a week off from food? Would this cause any problems?

I don't want to disturb the routine, but feel giving them a week off from feed would be good for them. Any thought?

They are almost a year old and weigh between 500-600g.