Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism and assimilated by the organism's cells in an effort to produce energy, maintain life, or stimulate growth.
Historically, people secured food through two methods: hunting and gathering, and agriculture. Today, most of the food energy consumed by the world population is supplied by the food industry.
Italian cuisine has developed through centuries of social and political changes, with roots as far back as the 4th century BCE. Italian cuisine in itself takes heavy influences, including Etruscan, ancient Greek, ancient Roman, Byzantine, and Jewish.
Significant changes occurred with the discovery of the New World and the introduction of potatoes, tomatoes, bell peppers and maize, now central to the cuisine but not introduced in quantity until the 18th century. Italian cuisine is noted for its regional diversity, abundance of difference in taste, and is known to be one of the most popular in the world, with influences abroad.