"In addition to having potential implications of kidney function and structure, high-protein diets may also lead to other metabolic complications.

High dietary intake of protein may lead to higher levels of urea and other nitrogenous waste products."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7460905/#:~:text=High%20dietary%20protein%20intake%20leads,time%20due%20to%20glomerular%20hyperfiltration.