>>12829314Basically animals have retarded metabolisms that can't make certain vitamins.
Our bodies are designed to break down when we don't have nutrients.
Triggers for that breakdown of our own bodies for energy relies on having vitamins that can only be gotten when food is present.
Hibernating creatures all have high nutrient deficiencies
So we need complex diets to survive famines well.
Tl;dr If you are missing a vitamin part of your body system will cannibalize an organ system
