"To damage the kidneys" refers to causing harm or injury to the organs in our body that filter waste products from our blood and help regulate fluid balance in the body. Full definition
These place less strain on the kidneys, the researchers discovered when they did experiments on rats with damaged kidneys. (ergo-log.com)
They also damage the kidneys and liver and increase the risk of certain forms of cancer. (drjockers.com)
So, now the truth that, those of us who follow a paleo diet have known all along — a high protein diet DOES NOT damage your kidneys. (paleodietnews.com)