There is no scientific evidence that high protein intake causes kidney problems in healthy individuals. I know many bodybuilders who have been consuming up to 500g of protein per day for extended periods of time.
I would be more cautious in recommending high protein intake in people with abnormal kidney function or kidney disease. The one thing we have to keep in mind though is that it takes a lot of water to metabolize protein. So in order to avoid dehydration, it is important to increase your water intake proportionally to your protein intake and exercise level. I always recommend water that is as close as possible to 100 ppm total electrolytes to which you can add your own trace elements in order to replenish the electrolytes lost during exercise.
You may also be interested in: