Thanks Nancy! I've been looking for that link ever since I lost it when our hard drive died. Basically beans and lentils are proteins...I think about 1/2 cup is about the same as 1 oz of meat that way. So as long as they are getting the protein from a good dog food or other source I'd think you'd be fine. Mine get enough protein that I don't always add in the peas and lentils as they don't eat it all that well either. Remember Becky's mix is a guide, you can play around with it and the rats will enjoy the variety. Mine is different every week depending on what I see on sale or add in (ends of boxes of cereal, bit of dry pasta left in a bag, etc.) I just make sure the basics are there (good dry kibble, lab block, large flake old fashioned oatmeal, etc.)