instead of revealing the formulas, could there be an hint next to the health or happiness
Ex. Healthy ... their health is increasing / or their health is decreasing.
Happiness - Walking on clouds - their happiness is stagnant (so you don't touch the plantation anymore)
Happiness - Walking on clouds - their happiness starts decreasing (so you need to increase meals or decrease hours of work)
Because now i have happiness at 97% and i want 100% but nothing happens if i increase meals. And if i increase working hours to 7-8 their happiness decrease
but at 4 hours it is nothing ! i mean in real life slaves worked many many hours, not 4 a day.
Just some hints to understand how happiness or experience or health is changing. And if you don't want that people try to exactly guess the formulas by testing, you can make that the hint changes after some hours from the change of the work hours or the change of meals.