Staple food
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A staple food is a food that forms the basis of a traditional diet, particularly that of the poor. Staple foods vary from place to place, but are typically inexpensive starchy foods of vegetable origin that are high in food energy and that can be stored for use throughout the year. Although nutritious, staple foods generally do not by themselves provide a full range of nutrients, so other foods need to be added to the diet to prevent malnutrition.
Most staple foods derive either from cereals such as wheat, maize, or rice, or starchy root vegetables such as potatoes, taro, and cassava. Other staple foods include pulses (dried legumes), sago (derived from the pith of the sago palm tree), and fruits such as breadfruit and plantains.
Rice is most commonly eaten as cooked entire grains, but most other cereals are milled into flour or meal which is used to make bread; noodles or other pasta; and porridges and "mushes" such as polenta or mealie pap. Mashed root vegetables can be used to make similar porridge-like dishes, including poi and fufu. Pulses (particularly chickpeas) and starchy root vegetables, such as Canna, can also be made into flour.
It has been hypothesized that some staple foods may act as a Giffen good in conditions of extreme poverty. A food shortage somewhere in the world could make use of staple foods because they are cheap and easy to make, and could feed thousands of people.
[edit] Worldwide variation
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