Humans need a lot of things to survive. Potassium, Sodium, Fat, Calories, Fiber, and a bunch of vitamins. The large assortments of food give people this. Calories give us energy, which we needed to hunt food thousands of years ago, and what we still need to walk around everyday, breath, sit, etc. Also, it is a form of entertainment for us. Animals developed taste buds to make eating food interesting. There are thousands of different flavors you can create with food .