It depends how you do it. My current approach relies on intermittent fasting for 18 hours (save it for coffee and salty water), and accasional 24-36 hours fast (approx every 6-8 weeks). Not a keto diet, but helps with training Ketons.

I hear this from barely healthy people all the time. Omg you're having too much lemon juice, too much salt, too much meat, too much butter, too much stinging nettle tea, skipping too many meals, on and on and on. Yet anyone I finally convince to eat like be literally changes their entire life so positively their entire world view and opinions about the medical field and government changes. Oh yes I'll worry about my kidney because I've stopped ingesting health destroying chemicals in basically all mass food, and focused on beef and fasting.

Live long enough and you turn to dust I guess.

or your heart: https://drstanfield.com/blogs/articles/lean-mass-hyper-respo...

That has been a concern of mine. What is the latest on that?

That's a myth.

Also high protein consumption is not a problem for kidneys.

There was a lot of bad science, this "protein is bad for the kidneys" comes from people who already had kidney issues from other reason beforehand, not from healthy people.