Well, yeah. Adipocytes multiply when you get fat. But when you lose weight, they don't apoptose, they just shrink in volume by giving up their lipid stores.
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Googled for "Adipocyte apoptosis" and oh boy... It does happen, but I don't trust the AI summary. This looks like a deep rabbit hole.
I lost 100 lbs fasting over 1.5 years. I did gain some weight back after stopping, but not much. Strangely, where I saw fat return was not where most of it came off.
If you have the time, I would really appreciate it if you reached out to me. You can find my contact info on my profile page, there's also a link to an anonymous contact form, if you'd prefer that. Thank you!