I'm not sure what the stats are, but my anecdote is that two family members who did long term keto have both developed permanent renal problems in their 60s. They can now eat only very little protein.
The one person's Dr. told her that the main issue is that she was eating way too much protein. Which might mean she wasn't doing Keto quite right. But I don't know enough about the diet myself to say for sure.
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I'm not sure what the stats are, but my anecdote is that two family members who did long term keto have both developed permanent renal problems in their 60s. They can now eat only very little protein.
The one person's Dr. told her that the main issue is that she was eating way too much protein. Which might mean she wasn't doing Keto quite right. But I don't know enough about the diet myself to say for sure.