I have not seen that before, and it's probably a bug. You can fix it by editing the savefile, but do you know how it happened? Also, could you send a screenshot?
here is a screenshot and the last thing I did that could have possibly affected this is that I fed my character some fries I think it was ether 1 or 2 nothing more though and after i noticed i fed her some more to try to get in the positives. it could also be that i messed with the "+" and "-" things for the chest a bit but that's it honestly. Sorry if that doesn't help.
Edit: also where would i go to edit character data spesificly cuz I'm on windows and I don't have the "%localappdata%/gain_factory" file i just have data.win and I've opended it up in the notepad and is a lot of unknown cybols and I'm a tad out of my coding element. Again sorry.
I still wasn't able to replicate it. I'll leave the case open for now.
The %localappdata% is on windows, it is a shortcut to a folder. If you paste "%localappdata%/gain_factory/game_data_.ini" in the address bar in file explorer it should open the savefile (which is human readable). The easiest thing is to do a reset for your player nutrition. Before editing the savefile, you can put all the body parts back to 1, and in the savefile, you can set "upgrade_points_", "upgrade_points_total_", and "nutrition_points_current_" to 0.0.
If you could reply with what values these three variables have before you edit them, that would maybe give me a hint to what the issue is.
ok so this is what i found at the bottom of the file for the upgrade points, upgrade points total and nutrition points current:<upgrade_points_total_<:-2.0(followed by fat level and other stuff including nutrition points top witch is at @@nan$$) <:4.0,<nutrition_points_current_<:382.0,<upgrade_points_<:-3.0, (followed by creative enabled witch is at 0.0)