You should feed:

• Good quality pellets or cubes formulated for rats – these should be the foundation of their diet (ensure they have a protein content of approximately 14-16% and a fat content of approximately 5%, note that animals who are breeding will need higher protein levels). Feed the amount recommended by the food’s nutrition guide and in consultation your veterinarian to make sure your rats are getting enough food but not too much (too much food can lead to obesity).
• Small amounts of fresh dark greens and non-starchy vegetables as part of their daily food allowance (not in addition to it); for example: bok choy/other Asian greens, parsley, kale, beet greens, broccoli, green beans, carrots, and zucchini.

You can feed treats, but these should be given infrequently in small amounts (no more than 10% of the total calories the rats need); for example, fruits like apples, berries, and kiwi. Reserve treats for rewards during training and special occasions.