The food is usually of carbohydrates, fat, protein or water, by eating or drinking for human or biological material of nutrition or pleasure. Source of food of plant, animal or other creature, such as fungi, or will of fermented products like alcohol. Human by gathering, farming, animal husbandry, hunting, fishing and many different ways to obtain food.
The popular view that the substance known as food for human or animal consumption. According to the definition of Li millet uniform expert, that the food is able to meet the normal physiological and biochemical needs, and can be sustained in the normal life of the material. On the human body, able to meet the needs of the people's normal life activities and is conducive to prolonging the life of the material referred to as food.
The emergence of agriculture is the origin of human civilization. Prior to this, people rely on food sources hunters and gatherers, their lives to the number of wild plants and animals for the transfer. With the ancestors of all over the world gathering economy based on practice and long-term life, and gradually to observe and become familiar with the law of the growth of certain plants, and slowly understand how to cultivate crops. Due to the development of regional economic differences, the world's leading early farming center of the three regions, West Asia, East Asia, the Zagros Mountains, West Asia, Central and South America, the southern peninsula of Asia Minor, the eastern Mediterranean coast of Jordan, Palestine, Lebanon, is the world's first the birthplace of agriculture, barley, wheat, lentils of origin; ancient India around 4500 BC began the cultivation of rice; 7000 BC, in northern Thailand have been planted beans, gourd, cucumber crops in Central and South America, Mexico, Peru, Bolivia, respectively, of origin of maize, beans, potatoes and other crops.