The message log is periodically reporting that my character's stomach feels empty, seemingly regardless of the state of my hunger level. I haven't continued the save long enough to see if I start gaining levels of starvation yet, but it feels like the hunger system is working fine despite the messages, so it appears like some sort of logic issue. I also have no statuses in the @ screen that describe any long term starvation effects or anything, nor any traits that affect hunger positively or negatively.
Unsure, though I do run with quite a few mods so it's possible it could be a mod conflict. This started happening since updating to experimental build 9552. Started sleeping and the message kept popping up as time passed.
Not receiving the message when I'm not hungry.

I started at Full hunger status here and as I read the book it progressed to Very Hungry, but the messages were appearing right off the bat.
I've encountered this too with a much shorter mod list. It might be some parasite or disease that's hidden from the player? I'm not sure.
Full indicates that your character's stomach is full (they are not hungry), not the state of their general nutrition (amount of energy they have stored in calories).
That message indicates that you have less than 80% of your healthy calories.
As such, this is not a bug - but this message could use some more clarification.
So it's a matter of just not eating enough to satisfy hunger in a longer term? It is a bit confusing at times exactly how the hunger system works.
So it's a matter of just not eating enough to satisfy hunger in a longer term
Yes, but it's not that you're not eating enough to satisfy hunger, it's that you're not eating enough to satisfy your caloric needs.
Well damn, I guess even with simplified nutrition it's not so simple. The more you know. That being said, I think it should be represented to the player in a way that makes it easier for newer players to understand. Perhaps a vague sense given like the other info, and numeric details available when applicable (self-aware trait, etc.).
Ah, that makes sense. Definitely needs a more explicit message.
This should probably still be clarified, I've been getting "Stomach feels empty" messages on a character I've been playing for a couple days now, despite keeping their stomach full one way or another. I thought I was consuming enough calories to be healthy and had no idea that for the past 2 days I've been below 80% of the healthy requirement.
The message could probably be changed to: "You feel sluggish, like your body needs to consume more calories."
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Full indicates that your character's stomach is full (they are not hungry), not the state of their general nutrition (amount of energy they have stored in calories).
That message indicates that you have less than 80% of your healthy calories.
As such, this is not a bug - but this message could use some more clarification.