"Despite some evidence that higher protein intakes can increase glomerular filtration rate, the evidence linking this normal physiologic response to progressive loss of kidney function in healthy people is completely lacking." Phinney, Stephen; Volek, Jeff (2011-07-08). The Art and Science of Low Carbohydrate Living: An Expert Guide to Making the Life-Saving Benefits of Carbohydrate Restriction Sustainable and Enjoyable (Kindle Locations 878-882).
"While protein restriction may be appropriate for treatment of existing kidney disease, we find no significant evidence for a detrimental effect of high protein intakes on kidney function in healthy persons after centuries of a high protein Western diet." Martin, W. F., Armstrong, L. E., & Rodriguez, N. R. (2005). Dietary protein intake and renal function. Nutrition & metabolism, 2(1), 25. doi:10.1186/1743-7075-2-25