Food is any substance that can be consumed, including liquid drinks. Food is the main source of energy and of nutrition for animals, and is usually of animal or plant origin. Many countries have a recognizable cuisine, a specific set of cooking traditions and practices.
The study of food is called food science. In English, the term food is often used metaphorically or figuratively, as in food for thought.
Humans are commonly believed to be omnivorous animals that can consume both plant and animal products. Evidence suggests that early humans employed hunter-gatherer techniques as their primary method of food collection. This involves combining stationary plant and fungal food sources (such as fruits, grains, roots, and mushrooms) with mobile animals which must be hunted and killed in order to be consumed. Additionally, it is believed that humans have used fire to prepare food prior to eating since their divergence from Homo erectus, possibly even earlier.
At least ten thousand years ago, humans developed agriculture, which has altered the kind of food people eat. This led to a variety of important historical consequences, such as increased population, the development of cities, and the wider spread of infectious diseases. The types of food consumed, and the way in which they are prepared, have varied widely by time, location, and culture.
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