Eating lots of protein makes your kidneys work harder in healthy people, but it probably doesn't harm them if your kidneys are already healthy. However, if you have kidney problems, high protein might make them worse.

Eating a lot of protein doesn't hurt your kidneys, and this is shown by normal test results for kidney health.

Eating a lot of protein might make your kidneys work too hard, based on a big study of over 9,000 adults.

Eating more protein is linked to how well your kidneys filter blood, even when considering other health factors like weight and blood pressure.

Eating more protein, adjusted for your ideal weight, is linked to better kidney filtering in healthy Japanese adults, even when other health factors are considered.

Eating a lot of protein might make kidney function get worse faster in people whose kidneys are already working too hard, but it doesn't seem to affect people with normal kidney function.