A staple food, or simply a staple, is a food that is eaten routinely and in such quantities that it constitutes a dominant portion of a standard diet for a given people, supplying a large fraction of energy needs and generally forming a significant proportion of the intake of other nutrients as well. The staple food of a specific society may be eaten as often as every day or every meal, and most people live on a diet based on just a small number of staples.
Staple foods vary from place to place, but typically they are inexpensive or readily-available foods that supply one or more of the three organic macronutrients needed for survival and health: carbohydrates, proteins, and fats. Typical examples of staples include tubers and roots; and grains, legumes, and other seeds. Early agricultural civilizations valued the foods that they established as staples because, in addition to providing necessary nutrition, they generally are suitable for storage over long periods of time without decay. Such nonperishable foods are the only possible staples during seasons of shortage, such as dry seasons or cold temperate winters, against which times harvests have been stored. During seasons of plenty, wider choices of foods may be available.
Main staple foods are derived either from vegetables and animal products, including cereals (such as rice, wheat, maize, millet, or sorghum), starchy tubers or root vegetables (such as potatoes, cassava, yams, or taro), meat, fish, eggs, milk, and cheese. Other staple foods include pulses (dried legumes), sago (derived from the pith of the sago palm tree), and fruits (such as breadfruit and plantains). Staple foods may also contain (depending on the region): olive oil, coconut oil and sugar (e.g., from plantains).
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Demographics
Of the more than 50,000 edible plant species in the world, only a few hundred contribute significantly to human food supplies. Although there are over 10,000 species in the cereal family, just a few have been widely cultivated over the past 2,000 years.
The staple food in different parts of the world is a function of weather patterns, local terrain, farming constraints, acquired tastes and ecosystems. For example, the main energy source staples in the average African diet are cereals (46 percent), roots and tubers (20 percent) and animal products (seven percent). In Western Europe the main staples in the average diet are animal products (33 percent), cereals (26 percent), and roots and tubers (four percent).
Most of the global human population lives on a diet based on one or more of the following staples: rice, wheat, maize (corn), millet, sorghum, roots and tubers (potatoes, cassava, yams and taro), and animal products such as meat, milk, eggs, cheese and fish. Regional staples include rye, soybeans, barley, oats, and teff.
Just 15 crop plants provide 90 percent of the world's food energy intake (exclusive of meat), with rice, maize, and wheat comprising two-thirds of human food consumption. The three are the staples of about 80 percent of the world population, and rice feeds almost half of humanity.
Roots and tubers, meanwhile, are important staples for over one billion people in the developing world, accounting for roughly 40 percent of the food eaten by half the population of sub-Saharan Africa. Roots and tubers are high in carbohydrates, calcium, and vitamin C, but low in protein. Cassava root is a major staple food in the developing world, providing a basic diet for around 500 million people.
With economic development and free trade, many countries have shifted away from low-nutrient-density staple foods to higher-nutrient-density staples, as well as towards greater meat consumption. Despite this trend, there is growing recognition of the importance of traditional staple crops in nutrition. Efforts are underway to identify better strains with superior nutrition, disease resistance, and higher yields.
Some foods like quinoa -- a pseudocereal grain that originally came from the Andes -- were also staple foods centuries ago. Oca, ulluku and amaranth seed are other foods claimed to be historical Andean staples. Pemmican was a staple of the Plains Indians of North America. In 2010, the global consumption of "speciality grains" such as quinoa was very small compared to other staples such as rice, wheat, and maize. These grains, once popular but then forgotten, are being reevaluated and reintroduced.
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Production
Most staple food is produced using modern and conventional farming practices. However, the production of staple food using organic farming methods is growing.
Refining
Rice is most commonly cooked and eaten as entire grains, but most other cereals are milled into flour or meal, which is used to make bread, noodles/ pasta, porridges and "mushes" like mealie pap. Mashed root vegetables can be used to make porridge-like dishes, including poi and fufu. Pulses (such as chickpeas, from which gram flour is made) and starchy root vegetables such as canna rhizomes can also be made into flour.
Part of balanced nutrition
Although nutritious, vegetable staples generally do not provide a full range of nutrients, so other foods need to be added to the diet, to ward off malnutrition. The deficiency disease pellagra is associated with a diet consisting primarily of maize; the disease beriberi with a diet of white (refined) rice.
Research published in the journal Nature has indicated that the nutritional value of some staple foods are negatively impacted by higher levels of carbon dioxide.
Nutritional content
The following table shows the nutrient content of major staple vegetable foods in raw form, with the caveat that raw grains are not edible and cannot be digested. Raw grains must be sprouted, or prepared and cooked for human consumption. In sprouted and cooked form, the relative nutritional and anti-nutritional contents of each of these grains is remarkably different from that of raw form of these grains (reported in this table). Potatoes must also be cooked and should not be sprouted.
Note: The highlighted value is the highest nutrient density amongst these staples. Other foods of the world, consumed in smaller quantities, may have nutrient densities higher than these values.
Gallery of food staples
Source of the article : Wikipedia
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