As to the scientific studies, no, there really aren't any. We explored the subject here: http://www.thecatsite.com/t/239547/scientific-studies-supporting-raw-food-diet
Though there was a study recently conducted in dogs. The results of the study were presented at the 14th Annual AAVN Clinical Nutrition & Research Symposium earlier in June (this year). I haven't been able to locate the proceedings. But here is the press release about the study (note that it is partially cooked food, not raw, in the same manner that Dr. Pierson suggests): http://www.prnewswire.com/news-rele...for-dogs-than-processed-kibble-261652391.html
Though there was a study recently conducted in dogs. The results of the study were presented at the 14th Annual AAVN Clinical Nutrition & Research Symposium earlier in June (this year). I haven't been able to locate the proceedings. But here is the press release about the study (note that it is partially cooked food, not raw, in the same manner that Dr. Pierson suggests): http://www.prnewswire.com/news-rele...for-dogs-than-processed-kibble-261652391.html