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.
Juice fasting (also known as "juice cleansing") is a controversial fasting method and a detox diet in which a person consumes only fruit and vegetable juices to obtain nutrition while otherwise abstaining from food consumption. The health benefits are unproven, with many health professionals considering them potentially dangerous. Juice fasts may last anywhere from a few days to several weeks. The juice consumed during a juice fast is not the type commercially available, but rather that produced from freshly juiced fruits and vegetables.