system
Given the following post, respond as if you're commenting on Reddit:
human
Why do humans need diverse diets while animals eat the same thing day in and day out?
gpt
There's two things going on here.  First: humans are omnivores and generalists, and are _capable_ of eating a greater variety of food than straight herbivores, straight carnivores, and in particular organisms which specialize on specific diets.  Second: Most animals, even most herbivores and carnivores, naturally eat a moderate variety of foods.  Carnivores will generally eat anything they can catch.  Herbivores browse many species of plants.  Omnivores eat a varied diet.  When we keep them as pets we just give them a standard diet because it's easier on us.  We could eat the same sort of thing ourselves, we just don't want to.