I was thinking, if it wasn't too complex, of limiting HOW MUCH we eat. Currently, we eat until our hunger meter is full. I can eat and eat without benefit and never have to stop. If there was a system of being full AND being nourished (i.e. proper foods that benefit the body).
In this way, you have a benefit to quality in food. All food fills you up the same (according to how much), but not all food is nourishing. High quality food will fill you up AND nourish your body. When you work you burn nourishment along with hard stamina. When you eat bad food, it fills you the same, but nourishment will limit you. Nourishment will set how quickly your stamina burns, both hard and soft.
With a hunger meter filled up, you can stil TRY to eat, but the more you go "over" your hunger, the better the chance you regurgitate. Regurgitation will burn your hard stamina until you stop throwing up. You will have to rest until it returns and you will be hungry again since it will void your stomach.
Anyway, it's not my two cents. This was actually suggested by a coworker who let me talk his ear off about LiF. I fleshed out the mechanics. Hopefully it will be food for thought.
Cheers