This game feels like you enter an inescapable death spiral if you ever get sick. Become sick -> eat fruit and rest so you don't die -> get better but on, like, 1 hidden sickness hp so if you ever do anything at all it makes you sick again. So now if you work out, you'll become sick, so you can't do that. But because you don't work out, your health falls down to bad and you become sick. So you spend the entire day resting and eating fruit, and the day you're no longer sick you try working out once. Well, now you're sick again. And so you spend the day resting. Now you're Moribund. and etc, etc.
Recovering from this situation feels like trying to rebuild a house of cards while blindfolded, because you don't have access to any of the information needed to see what changes you for the better or worse in real time. When you recover from sickness, instead of being 1 bad move (or neutral move, or good move, or ANY MOVE) away from going back to being sick, you should be reset back to full or something.
Edit: Or maybe there should be a hospital location you can go to to get better without collapsing and getting a game over. Like seriously, I spent a save file exercising, swimming, eating mixed and fruit salads, frichti, and otherwise played this like a super healthy character, and her life expectancy cratered into the GROUND by the time she was 20. Something about the nutrition stat in this game is completely messed up.