Try not to give them much cheese if any. Rats are lactose intolerant, like dogs and cats.

Are they hydrated? Still drinking?

If you're worried, you can get some Hill's a/d from the vet and mix it with some store-brand Ensure(nutritional drink supplement of some sort), preferably the kind with 350 calories per can. You can also put the Ensure in a water bottle (for a few hours only, then refrigerate) and let them drink it that way.

You want them to stay hydrated and warm, eating is second on the list.

www.ratguide.com Look up the list of no-no foods. I believe tomatoes are on that list, and try not to feed too much broccoli or spinach(if you feed spinach). Oatmeal or baby cereal is a good alternative with some fruit(not too much) or a bit of yogurt mixed in.