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

A study found that eating more salt didn't really change how well the tiny filters in your kidneys work in healthy Japanese adults, even though people who ate more protein also tended to eat more salt.

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

Scientists measured how fast tiny filters in the kidneys work in healthy people, and it's the first time they've directly checked this in living humans using special scans and tissue samples.