“Large amounts of protein damage kidneys!”
The body’s own proteins constantly undergo the processes of building and reduction. Therefore, continuous protein consumption is essential in order to balance these processes. During decomposition of the proteins, urea is formed that should be egested via the kidneys. Hence, an increased protein intake is connected with the increased expulsion of urea. This does not damage the kidneys. The necessary prerequisite here is, of course, the fact that the body gets enough water in order to be able to egest the urinary excreted substances. If you suffer from kidney diseases, you should avoid increased protein consumption.