I went exploring and noticed 1/3 of my HHP was gone. I thought I might have eaten something that takes away HHP by mistake, although I didn't see any numbers popping up as it happens when you loose HPP.
So I kept going and didn't pay any attention to it anymore. When I got home I noticed my HHP had dropped to almost nothing:

What the fuck could have caused that? Here's **all** I've done while exploring:
- Ate a lot of blueberries and candleberries (I'm sure I haven't eaten any food that causes damage (according to the tooltip), at least not that much)
- Walked around a lot, even tired
- Boated a lot
- Lifted the boat a lot
- Got hungry, but not very hungry (only when I got home, as in the picture above)
- Got a few leeches (only two, not enough to do that sort of damage)
- Tracked a few scents
- Did some trespassing and stealing
- Traveled to my far away HF
- I was wearing boots the whole time
AFAIK none of those do any damage.
Fearing for my life I immediately stopped smoking my pipe, undressed and went to sleep. I logged in again and noticed the "Royal Toadstool" that I was studying (I didn't eat any) had "HHP 17.3" on the tooltip. I took it off the study window immediately and put a gauze on. I've been playing for ~1h now and the HHP seem to have stopped dropping.
So what the fuck could have cause that? The Toadstool indeed? Something else?
Whatever it was I'm sure there weren't any number popping up showing I was loosing HHP, which I guess should happen.