Food is the common denominator for anything nutritious we ingest.
Some researchers believe that the invention of cooking is what allowed humans to develop larger and more energy-costly brains than other primates. This is because cooking allows easier digestion of the food, which in turn allows us to sate the increased need for energy required by our larger brains.
- Suzana Herculano Houzel (June 2013). "What is so special about the human brain?". http://www.ted.com/talks/suzana_herculano_houzel_what_is_so_special_about_the_human_brain#t-794084. Retrieved February 16th 2016.