I was playing SCUM and I saw how complex the metabolism system was, and I thought, this would be pretty cool to have in Rimworld.
(https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwi12tyNrarfAhVF1IMKHVLbBnkQjRx6BAgBEAU&url=https%3A%2F%2Fgameplayreview.com%2Fmetabolism-food-scum-guide-tips%2F&psig=AOvVaw36eiCuE69fNbYQ8eSgwlSL&ust=1545255941482261)
I don't think it'll be that hard to code, just another bar that needs to be filled by consuming food. But hey, maybe I'm wrong and this is basically impossible I really don't know.