The more protein you eat the more filtration your kidneys have to do.
.6 – .8 grams per kg of lean body weight (Dr Robyn note: multiply your weight in pounds by .453592 to get kg then multiply that number by .7 to get an idea of how much protein your body needs. Keep in mind – this is LEAN body mass.)
This slide is from Dr Williams’ talk. But I think it fits here really well. 100grams is about half a cup. Keep in mind – more protein (particularly animal protein) is NOT better!

People with diabetes have large kidneys because the are reved up. Plant based diets are low in phosphates (good for kidneys)
Acidosis – kidneys helps excrete acid. Animal protein is very acidic.
Animal protein is directly related to kidney stones
The main causes (75%) of kidney failure is related to diabetes and high blood pressure

