http://ezinearticles.com/?Can-Excess...lth?&id=829995
Check that link and there are others that support my statement. Someone with healthy kidneys will be fine to consume quite a large amount of protein with no problems.
Some other reading suggests that too much protein without proper carb/fat balance is what causes the damage. I saw some figures of use 30% as your maximum calories to come from protein. This is about where I am at.
275g protein(4cal/g) = 1100cals
1100cals from protein / 3500 total cals (x100) = 31.4%
IW