https://www.britannica.com/topic/cereal
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Cereal, also called grain, any grass (family Poaceae) yielding starchy seeds suitable for food. Most grains have similar dietary properties; they are rich in carbohydrates but comparatively low in protein and naturally deficient in calcium and vitamin A. Breads, especially those made with refined flours, are usually enriched in order to compensate for any nutritional deficiencies in the cereal used. The cereals most commonly cultivated are wheat, rice, rye, oats, barley, corn (maize), and sorghum.
As human food, cereals are usually marketed in their raw grain form (some are frozen or canned) or as ingredients of various food products. As animal feed, they are consumed mainly by livestock and poultry, which are eventually rendered as meat, dairy, and poultry products for human consumption. Many cereals are used industrially in the production of a wide range of substances, such as glucose, adhesives, oils, and alcohols.
Corn, or maize (Zea mays), was originally domesticated in the Western Hemisphere by Native Americans and was then carried to Europe by the early explorers. It is a major crop cultivated in most temperate climates, although the United States is the single largest producer. For human consumption, corn is sold as a fresh vegetable or is canned or frozen. The grain also is processed into a growing number of food products, including corn flour, corn oil, corn syrup, and many other by-products. It is a very important animal feed and is heavily used in the production of cellulosic ethanol, a biofuel.
Rice (Oryza sativa) is the second largest cereal crop and is a staple food in all areas of Asia. Unlike wheat, which is generally raised on large farms and harvested mechanically, rice is usually grown on small paddies and harvested by hand. Cultivation methods have changed little over the centuries; the paddies are inundated with water, usually up to about 15 cm (6 inches), then drained and dried just before harvest. Most rice is milled for direct local consumption. Other products in which rice is used are breakfast cereals and such alcoholic beverages as Japanese sake.
Wheat (various Triticum species) is a major cereal crop and one of the oldest domesticated grains. In modern times, wheat is used to produce meal, breakfast cereals, and flour for bakery products. It can be cultivated in a wide range of soils but thrives in temperate climates.
Rye (Secale cereale) is widely used for bread making, second only to wheat for that purpose. It is also used in other bakery products and in distilled liquors, especially whiskey. Rye can be grown on relatively poor soils and is able to survive more-severe winters than most grains. Poland and Russia are some of the world’s largest rye producers.
Oats (Avena sativa) are grown in most of the temperate regions of the world, especially in the United States, Canada, and northern Europe. Most of the oats produced are used in animal feed, although they may also be processed for human consumption.
Barley (Hordeum vulgare) is also grown in temperate climates. It does not need especially rich soils. Most barley is used for animal feed, though it is also the source of the malt used in both the brewing of beer and the distillation of alcoholic beverages. Barley malt is also a constituent of vinegar and many breakfast foods.
Sorghum (Sorghum vulgare), also called milo, is principally grown for use as animal feed. Teff (Eragrostis tef) and millet (various species) are locally grown in a number of countries both for human consumption and as livestock feed.
Any food made from wheat, rice, oats, cornmeal, barley, or another cereal grain is a grain product. Bread, pasta, breakfast cereals, grits, and tortillas are examples of grain products. Foods such as popcorn, rice, and oatmeal are also included in the Grains Group.
Grains are divided into 2 subgroups: Whole Grains and Refined Grains. Whole grains contain the entire grain kernel ― the bran, germ, and endosperm. Examples of whole grains include whole-wheat flour, bulgur (cracked wheat), oatmeal, whole grain cornmeal, and brown rice. Refined grains have been milled, a process that removes the bran and germ. This is done to give grains a finer texture and improve their shelf life, but it also removes dietary fiber, iron, and many B vitamins. Some examples of refined grain products are white flour, corn grits, white bread, and white rice.
Refined grain choices should be enriched. This means certain B vitamins (thiamin, riboflavin, niacin, folic acid) and iron are added back after processing. Fiber is not added back to enriched grains. Check the ingredient list on refined grain products to make sure that the word "enriched" is included in the grain name. Some food products are made from mixtures of whole grains and refined grains. Only foods that are made with 100% whole grains are considered a whole grain food.
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