I keep loaning my stuff out and can't lay my hands on any direct sources at the moment. Try looking at the research section of www.lowcarbsuccess.net . A couple of other sites to check would be www.westonaprice.org and www.powerhealth.net . If these don't help, email me and i might be able to connect you to a source that would have primary evidence on the protein end of it. DLB