This is all highly speculative. I know near-zero about biology, chemistry, or physiology.

epistemic status: my ass

lmao this person writes a personal goodbye message, detailing their experience and motivations in what reads to be quite an important decision for them, and receives “15 disagrees” for their trouble, and this comment:

I gave this post a strong downvote because it merely restates some commonly held conclusions without speaking directly to the evidence or experience that supports those conclusions.

This is EA at its “open to criticism” peak.