I only know Peter Attia from a Joe Rogan podcast. Joe allows his guests to open up, and even encourages them to go beyond. That's what what makes the podcast so beautiful.
Peter never went beyond, which makes me think he has no idea what he is talking about.
On the flip side, Joe put Pavel T in the corner, and the true Pavel came out, balls and all.
Peter is just a replicant, big ag are selling less cereal, so let's pay someone to bring it back.
In Joe's podcast, Pavel when pressed, never denounced bodybuilding movements, however the Lord of fasting Mr Attia has now taken a 180.
Maybe he is losing muscle because he is not training in a way to maintain it?