Background: I'm playing on Very Hard (old Survival), and wanted to try a permadeath, no-health run.
I have noticed a non-deterministic health bar regeneration in Fallout 4, but I cannot pinpoint where it comes from. I just eventually notice that health is back when it shouldn't be. Also, any accumulated rads seem to disappear, and HP appears to go to max.
I installed a mod to stop health regen when levelling up (as well as other assorted texture packs and radio stations which shouldn't affect health). But this regen is not tied to level ups it seems to happen whenever I don't closely watch the health bar. Obviously, I didn't add any mods or perks that regen health.
As far as I understand it the game does not have a default regen-over-time mechanic for health.
Where could I be getting this health and RAD regeneration from?