I mean we’re slowly replacing every cell in our body like the ship of Theseus
Personally, I’d say nothing. Or, at least, whatever you say makes you, you. I don’t think there’s an objective/natural definition for who I am and what is and isn’t a part of me. The idea of “me” is kinda made-up, so there’s probably no right or wrong answer as to what exactly I label as “me.”
I’m probably just saying nonsense, but this is the most coherent answer I got lol
That’s a question no one has yet been able to answer definitively though both neuroscientists and philosophers are trying.
I’m of the opinion that “I” am a pattern, encoded in the physical interactions of my brain and body. I’m not certain if I have free will or just like to think I do. But I do believe that whatever makes me “me” is fully contained within the dimensions of my physical being.
The way out of the riddle is that there never was a ship of Theseus to begin with or a you those are just referents like pointers used to refer to an evolving system with a known state at a known starting point and probabilistic predictions of a future state based on known factors.
