Four: Raw dried beans and peanuts
You may think that giving your pet rat a handful of dried beans or raw peanuts would be just the ticket. They can gnaw on these hard, little foods, you think, and they just must be full of good things like vitamins and proteins.
But the truth is that these foods contain elements that destroy vitamin A in rats and cause red blood cells to clump. They also destroy enzymes that help rats digest starches. Note, however, that roasted peanuts are fine.