Rice is commonly consumed as food around the world. It occurs in long-, medium-, and short-grained types. It is the staple food of over half the world's population.

Hazards associated with rice consumption include arsenic from the soil, and Bacillus cereus which can grow in poorly-stored cooked rice, and cause food poisoning.

Types

The varieties of rice are typically classified as long-, medium-, and short-grained.^[1] The grains of long-grain rice (high in amylose) tend to remain intact after cooking; medium-grain rice (high in amylopectin) becomes more sticky. Medium-grain rice is used for sweet dishes, for risotto in Italy, and many rice dishes, such as arròs negre, in Spain. Some varieties of long-grain rice that are high in amylopectin, known as Thai Sticky rice, are usually steamed.^[2] A stickier short-grain rice is used for sushi;^[3] the stickiness allows rice to hold its shape when cooked.^[4] Short-grain rice is used extensively in Japan,^[5] including to accompany savoury dishes.^[6] Short-grain rice is often used for rice pudding.

Independent of grain length and starchiness, rice can also be differentiated by traits such as aroma^[7] and pigmentation (red, black). So-called wild rice, which are close cousins of domesticated rice, are not usually included in this classification.

• 
  Rice comes in many shapes, colors, and sizes
• 
  Jumli Marshi rice, unhulled, Nepal

Rice also differs by the processing applied to it. Rice starts as whole seeds with inedible rice hulls; removing the hull by milling produces brown rice. Polishing produces first rice with germ, then white rice. Cooking white rice then drying produces instant rice, though there is a significant degradation in taste and texture. Parboiled rice is different from instant rice: parboiled rice is first part-cooked with the husk before milling.

Rice flour and starch often are used in batters and breadings to increase crispiness.

• 
  Rice processing
  A: Rice with chaff
  B: Brown rice
  C: Rice with germ
  D: White rice with bran residue
  E: Polished
  (1): Chaff
  (2): Bran
  (3): Bran residue
  (4): Cereal germ
  (5): Endosperm
• 
  Unmilled to milled Japanese rice, from left to right, brown rice, rice with germ, white rice
• 
  Cooked brown rice, Bhutan
• 
  Cooked white rice

Taste Factors

The two main components and determinants of taste in rice are starch and protein.^[8][9] 80-90% of the weight of an uncooked rice grain is starch, and 7-10% is protein.^[9][10] Other important components of rice include fat, fibers, and minerals, all comprising less than 1% of rice by weight.^[11]

The ratio of the two types of starch, linear amylose and branched amylopectin, affects cooked rice texture. Rice is mostly amylopectin, with amylose making up only 0-30% of the total starch.^[11][12] Amylopectin chains form double helices with each other and encourage crystallization, which raises the peak viscosity and starch gelatinization ability of cooked rice,^[12][13] meaning higher amylopectin content in rice will lead to a stickier cooked product.^[14] Gelatinization is also inhibited by protein, and a higher protein content leads to increased hardness of the surface of rice grains.^[8][13] Protein and amylose content is determined by the conditions of rice growth. Higher concentrations of fertilizer result in higher protein content,^[15][16] and nonoptimal environmental factors such as higher temperature and insufficient water make rice chalkier by decreasing starch levels.^[17][18]

Preparation

Rinsing rice before cooking removes much of the starch, thereby reducing the extent to which individual grains will stick together. This yields a fluffier rice, whereas not rinsing yields a stickier and creamier result.^[19] Rice produced in the US is usually fortified with vitamins and minerals, and rinsing will result in a loss of nutrients. In 2007, Haitian jails suffered from a beriberi epidemic as US-supplied enriched rice were washed before cooking, stripping them of the nutritious layer;^[20] this is despite FDA's rules requiring fortification nutrients to be somewhat resistant to washing.^[21]

Rice may be soaked to decrease cooking time, conserve fuel, minimize exposure to high temperature, and reduce stickiness. For some varieties, soaking improves the texture of the cooked rice by increasing expansion of the grains. Rice may be soaked for 30 minutes up to several hours.

Brown rice may be soaked in warm water for 20 hours to stimulate germination. This process, called germinated brown rice (GBR),^[22] activates enzymes and enhances amino acids including gamma-aminobutyric acid to improve the nutritional value of brown rice. This method is a result of research carried out for the United Nations International Year of Rice.

Rice is cooked by boiling or steaming, and absorbs water during cooking. With the absorption method, rice is cooked in a volume of water equal to the volume of dry rice plus any evaporation losses, which is commonly measured with the tip of the finger.^{[23][24][25][26]} With the rapid-boil method, rice may be cooked in a large quantity of water which is drained before serving. Rapid-boil preparation is not desirable with enriched rice, as much of the enrichment additives are lost when the water is discarded. Electric rice cookers, popular in Asia and Latin America, simplify the process of cooking rice. Rice (or any other grain) is sometimes quickly fried in oil or fat before boiling (for example saffron rice or risotto); this makes the cooked rice less sticky, and is a cooking style commonly called pilaf in Iran and Afghanistan or biryani in India and Pakistan.

Dishes

In Arab cuisine, rice is an ingredient of many soups and dishes with fish, poultry, and other types of meat. It is used to stuff vegetables or is wrapped in grape leaves (dolma). When combined with milk, sugar, and honey, it is used to make desserts. In some regions, such as Tabaristan, bread is made using rice flour. Rice may be made into congee (also called rice porridge or rice gruel) by adding more water than usual, so that the cooked rice is saturated with water, usually to the point that it disintegrates. Rice porridge is commonly eaten as a breakfast food, and is a traditional food for the sick.

Nutrition

Rice is the staple food of over half the world's population. It is the predominant dietary energy source for 17 countries in Asia and the Pacific, 9 countries in North and South America and 8 countries in Africa. Rice provides 20% of the world's dietary energy supply, while wheat supplies 19% and maize (corn) 5%.^[27]

Cooked unenriched long-grain white rice is composed of 68% water, 28% carbohydrates, 3% protein, and 1% fat (table). A 100-gram (3+1⁄2-ounce) reference serving of it provides 540 kilojoules (130 kilocalories) of food energy and contains moderate amounts of manganese per 100-gram serving (table). Cooked unenriched short-grain rice has a very similar nutritional profile (see footnote link).^[28]

A detailed analysis of nutrient content of rice suggests that the nutrition value of rice varies based on a number of factors. It depends on the type and strain of rice, such as white, brown, red, and black (or purple) varieties, each having different prevalence across world regions.^[29] It also depends on nutrient quality of the soil rice is grown in, whether and how the rice is polished or processed, the manner it is enriched, and how it is prepared before consumption.^[30]

A 2018 World Health Organization (WHO) guideline showed that fortification of rice to reduce malnutrition may involve different micronutrient strategies, including iron only, iron with zinc, vitamin A, and folic acid, or iron with other B-complex vitamins, such as thiamin, niacin, vitamin B6, and pantothenic acid.^[29] A systematic review of clinical research on the efficacy of rice fortification showed the strategy had the main effect of reducing the risk of iron deficiency by 35% and increasing blood levels of hemoglobin.^[29] The guideline established a major recommendation: "Fortification of rice with iron is recommended as a public health strategy to improve the iron status of populations, in settings where rice is a staple food."^[29]

Rice grown experimentally under elevated carbon dioxide levels, similar to those predicted for the year 2100 as a result of human activity, had less iron, zinc, and protein, as well as lower levels of thiamin, riboflavin, folic acid, and pantothenic acid.^[31] The following table shows the nutrient content of rice and other major staple foods in a raw form on a dry weight basis to account for their different water contents.^[32]

Hazards

References