Edible mushroom

Vitamin D Shiitake Phosphorus
White mushrooms - while common, they are just one of the many types of mushrooms cultivated and eaten
Assorted wild edible mushrooms in a basket
Edible mushrooms on sale in Warsaw
Khumbhi (local name for Podaxis in the Thar Desert) grow in abundance after rains[1]

Edible mushrooms are the fleshy and edible fruit bodies of several species of macrofungi (fungi which bear fruiting structures that are large enough to be seen with the naked eye). They can appear either below ground (hypogeous) or above ground (epigeous) where they may be picked by hand.[2] Edibility may be defined by criteria that include absence of poisonous effects on humans and desirable taste and aroma.[3]

Edible mushrooms are consumed for their nutritional and culinary value. Mushrooms, especially dried shiitake, are sources of umami flavor from guanylate.[4] Mushrooms consumed by those practicing folk medicine are known as medicinal mushrooms. While psychedelic mushrooms are occasionally consumed for recreational or entheogenic purposes, they can produce psychological effects, and are therefore not commonly used as food.[5] There is no evidence from high-quality clinical research that "medicinal" mushrooms have any effect on human diseases.[6][7]

Edible mushrooms include many fungal species that are either harvested wild or cultivated. Easily cultivated and common wild mushrooms are often available in markets, and those that are more difficult to obtain (such as the prized truffle, matsutake and morel) may be collected on a smaller scale by private gatherers. Some preparations may render certain poisonous mushrooms fit for consumption.

Before assuming that any wild mushroom is edible, it should be identified. Accurate determination and proper identification of a species is the only safe way to ensure edibility, and the only safeguard against possible accident. Some mushrooms that are edible for most people can cause allergic reactions in some individuals, and old or improperly stored specimens can cause food poisoning. Great care should therefore be taken when eating any fungus for the first time, and only small quantities should be consumed in case of individual allergies. Deadly poisonous mushrooms that are frequently confused with edible mushrooms and responsible for many fatal poisonings include several species of the genus Amanita, in particular, Amanita phalloides, the death cap. It is therefore better to eat only a few, easily recognizable species, than to experiment indiscriminately. Moreover, even normally edible species of mushrooms may be dangerous, as mushrooms growing in polluted locations can accumulate pollutants such as heavy metals.[8]

Baskets of mixed culinary mushrooms at the San Francisco Ferry Building

History of mushroom use

Mycophagy /mˈkɒfəi/, the act of consuming mushrooms, dates back to ancient times. Edible mushroom species have been found in association with 13,000-year-old archaeological sites in Chile. Ötzi, the mummy of a man who lived between 3400 and 3100 BCE in Europe, was found with two types of mushroom. The Chinese value mushrooms for supposed medicinal properties as well as for food. Ancient Romans and Greeks, particularly the upper classes, used mushrooms for culinary purposes.[5] Food tasters were employed by Roman emperors to ensure that mushrooms were safe to eat.[9]

Current culinary use

Commercially cultivated

Common white mushrooms cooking, from raw (in the lower left) to cooked (in the upper right).
Common white mushrooms cooking, from raw (lower left) to cooked (upper right).

Mushroom cultivation has a long history, with over twenty species commercially cultivated. Mushrooms are cultivated in at least 60 countries[10] with China, the United States, Poland, Netherlands, and India being the top five producers in 2013.[11]

A fraction of the many fungi consumed by humans are currently cultivated and sold commercially. Commercial cultivation is important ecologically, as there have been concerns of depletion of larger fungi such as chanterelles in Europe, possibly because the group has grown popular, yet remains a challenge to cultivate.

Commercially cultivated Japanese edible mushroom species - clockwise from left, enokitake, buna-shimeji, bunapi-shimeji, king oyster mushroom and shiitake

Commercially harvested wild edibles

Calvatia gigantea the giant puffball for sale at a market in England
Calbovista subsculpta commonly known as the sculptured giant puffball

Some species are difficult to cultivate; others (particularly mycorrhizal species) have not yet been successfully cultivated. Some of these species are harvested from the wild, and can be found in markets. When in season they can be purchased fresh, and many species are sold dried as well. The following species are commonly harvested from the wild:

Other edible wild species

Many wild species are consumed around the world. The species which can be identified "in the field" (without use of special chemistry or a microscope) and therefore safely eaten vary widely from country to country, even from region to region. This list is a sampling of lesser-known species that are reported as edible.

Conditionally-edible species

A. muscaria, a conditionally-edible species

Nutrients

White mushrooms, raw
Nutritional value per 100 g (3.5 oz)
Energy93 kJ (22 kcal)
3.3 g
0.3 g
3.1 g
VitaminsQuantity %DV
Vitamin A equiv.
0%
0 μg
Thiamine (B1)
7%
0.08 mg
Riboflavin (B2)
33%
0.4 mg
Niacin (B3)
24%
3.6 mg
Pantothenic acid (B5)
30%
1.5 mg
Vitamin B6
8%
0.1 mg
Folate (B9)
4%
17 μg
Vitamin B12
0%
0 μg
Choline
4%
17.3 mg
Vitamin D
1%
7 IU
Vitamin E
0%
0 mg
Vitamin K
0%
0 μg
MineralsQuantity %DV
Calcium
0%
3 mg
Copper
16%
0.32 mg
Iron
4%
0.5 mg
Magnesium
3%
9 mg
Manganese
2%
0.05 mg
Phosphorus
12%
86 mg
Potassium
7%
318 mg
Selenium
13%
9.3 μg
Zinc
5%
0.52 mg
Other constituentsQuantity
Water92 g

Percentages are roughly approximated using US recommendations for adults.
White mushrooms, cooked, boiled, drained, without salt
Nutritional value per 100 g (3.5 oz)
Energy117 kJ (28 kcal)
5.3 g
0.5 g
2.2 g
VitaminsQuantity %DV
Vitamin A equiv.
0%
0 μg
Thiamine (B1)
9%
0.1 mg
Riboflavin (B2)
25%
0.3 mg
Niacin (B3)
30%
4.5 mg
Pantothenic acid (B5)
44%
2.2 mg
Vitamin B6
8%
0.1 mg
Folate (B9)
5%
18 μg
Vitamin B12
0%
0 μg
Choline
4%
19.9 mg
Vitamin D
4%
21 IU
Vitamin E
0%
0 mg
Vitamin K
0%
0 μg
MineralsQuantity %DV
Calcium
1%
6 mg
Copper
25%
0.5 mg
Iron
13%
1.7 mg
Magnesium
3%
12 mg
Manganese
5%
0.1 mg
Phosphorus
12%
87 mg
Potassium
8%
356 mg
Selenium
19%
13.4 μg
Zinc
9%
0.9 mg
Other constituentsQuantity
Water91.1 g

Percentages are roughly approximated using US recommendations for adults.

A commonly eaten mushroom is the white mushroom (Agaricus bisporus). In a 100-gram (3 12-ounce) reference serving, Agaricus mushrooms provide 92 kilojoules (22 kilocalories) of food energy and are 92% water, 3% carbohydrates, 3% protein, and 0.3% fat (table). They contain high levels (20% or more of the Daily Value, DV) of riboflavin, niacin, and pantothenic acid (24–33% DV), with moderate content of phosphorus (table). Otherwise, raw white mushrooms generally have low amounts of essential nutrients (table). Although cooking (by boiling) lowers mushroom water content only 1%, the contents per 100 grams for several nutrients increase appreciably, especially for dietary minerals (table for boiled mushrooms).

The content of vitamin D is absent or low unless mushrooms are exposed to sunlight or purposely treated with artificial ultraviolet light (see below), even after harvesting and processed into dry powder.[26][27]

Vitamin D

Mushrooms exposed to ultraviolet (UV) light produce vitamin D2 before or after harvest by converting ergosterol, a chemical found in large concentrations in mushrooms, to vitamin D2.[26][27] This is similar to the reaction in humans, where vitamin D3 is synthesized after exposure to sunlight.

Testing showed an hour of UV light exposure before harvesting made a serving of mushrooms contain twice the U.S. Food and Drug Administration's daily recommendation of vitamin D, and 5 minutes of artificial UV light exposure after harvesting made a serving of mushrooms contain four times the FDA's daily recommendation of vitamin D.[26] Analysis also demonstrated that natural sunlight produced vitamin D2.[27]

The ergocalciferol, vitamin D2, in UV-irradiated mushrooms is not the same form of vitamin D as is produced by UV-irradiation of human or animal skin, fur, or feathers (cholecalciferol, vitamin D3). Although vitamin D2 clearly has vitamin D activity in humans and is widely used in food fortification and in nutritional supplements, vitamin D3 is more commonly used in dairy and cereal products.

Name Chemical composition Structure
Vitamin D1 ergocalciferol with lumisterol, 1:1[28]
Vitamin D2 ergocalciferol (made from ergosterol) Note double bond at top center.
Vitamin D3 cholecalciferol (made from 7-Dehydrocholesterol in the skin). Cholecalciferol.svg
The photochemistry of Vitamin D biosynthesis

Use in traditional medicine

Medicinal mushrooms are mushrooms or extracts from mushrooms that are thought to be treatments for diseases, yet remain unconfirmed in mainstream science and medicine, and so are not approved as drugs or medical treatments.[29] Such use of mushrooms therefore falls into the domain of traditional medicine[30] for which there is no high-quality clinical evidence of efficacy.[6][7]

Preliminary research on mushroom extracts has been conducted to determine if anti-disease properties exist, such as for polysaccharide-K[31] or lentinan.[32] Some extracts have widespread use in Japan, Korea and China, as potential adjuvants to radiation treatments and chemotherapy.[33][34] As of 2019, there is no evidence that consuming mushrooms or mushroom extracts has any effect on human diseases.[6][7]

Safety concerns

Some wild species are toxic, or at least indigestible, when raw.[35] The safety of consuming Reishi mushrooms has not been adequately demonstrated, as of 2019.[6] Reishi mushrooms may cause side effects including dryness of the mouth or throat, itchiness, rash, stomach upset, diarrhea, headache, or allergic reactions.[6] Failure to identify poisonous mushrooms and confusing them with edible ones has resulted in death.[35][36][37]

Production

Mushroom and truffle output in 2011
Mushroom- and truffle-producing countries in 2011[38]
Country Output
tonnes long tons short tons % of world output
Albania 123 121 136 0.00160
Algeria 220 220 240 0.00286
Australia 49,696 48,911 54,780 0.646
Austria 1,600 1,600 1,800 0.0208
Azerbaijan 1,450 1,430 1,600 0.0188
Belarus 5,934 5,840 6,541 0.0771
Belgium 41,556 40,900 45,808 0.540
Bosnia and Herzegovina 994 978 1,096 0.0129
Brunei Darussalam 11 11 12 0.000143
Bulgaria 2,171 2,137 2,393 0.0282
Canada 78,930 77,680 87,010 1.03
People's Republic of China 5,008,850 4,929,740 5,521,310 65.1
Cyprus 730 720 800 0.00948
Czech Republic 361 355 398 0.00469
Denmark 10,304 10,141 11,358 0.134
Estonia 125 123 138 0.00162
Finland 1,668 1,642 1,839 0.0217
France 115,669 113,842 127,503 1.50
Germany 62,000 61,000 68,000 0.805
Greece 3,255 3,204 3,588 0.0423
Hungary 14,249 14,024 15,707 0.185
Iceland 583 574 643 0.00757
India 41,000 40,000 45,000 0.533
Indonesia 45,851 45,127 50,542 0.596
Iran 37,664 37,069 41,517 0.489
Ireland 67,063 66,004 73,924 0.871
Israel 10,001 9,843 11,024 0.130
Italy 761,858 749,826 839,805 9.90
Japan 60,180 59,230 66,340 0.782
Jordan 1,123 1,105 1,238 0.0146
Kazakhstan 558 549 615 0.00725
Kyrgyzstan 201 198 222 0.00261
Latvia 517 509 570 0.00672
Lithuania 13,008 12,803 14,339 0.169
Luxembourg 5 4.9 5.5 0.0000649
Madagascar 2,087 2,054 2,301 0.0271
Malta 947 932 1,044 0.0123
Moldova 475 467 524 0.00617
Mongolia 278 274 306 0.00361
Morocco 2,045 2,013 2,254 0.0266
Netherlands 304,000 299,000 335,000 3.95
New Zealand 9,884 9,728 10,895 0.128
North Korea 6,777 6,670 7,470 0.0880
Philippines 571 562 629 0.00742
Poland 198,235 195,104 218,517 2.57
Portugal 1,240 1,220 1,370 0.0161
Romania 7,661 7,540 8,445 0.0995
Russia 4,200 4,100 4,600 0.0546
Réunion 61 60 67 0.000792
Serbia 4,851 4,774 5,347 0.0630
Singapore 200 200 220 0.00260
Slovakia 1,898 1,868 2,092 0.0247
Slovenia 1,060 1,040 1,170 0.0138
South Africa 12,568 12,370 13,854 0.163
South Korea 30,574 30,091 33,702 0.397
Spain 127,000 125,000 140,000 1.65
Switzerland 8,465 8,331 9,331 0.110
Thailand 6,791 6,684 7,486 0.0882
Macedonia 2,784 2,740 3,069 0.0362
Tunisia 122 120 134 0.00158
Turkey 27,058 26,631 29,826 0.351
Ukraine 14,000 14,000 15,000 0.182
United Kingdom 69,300 68,200 76,400 0.900
United States 390,902 384,728 430,896 5.08
Uzbekistan 661 651 729 0.00859
Vietnam 21,957 21,610 24,203 0.285
Zimbabwe 613 603 676 0.00796
World 7,698,773 7,577,183 8,486,445 100

See also

References

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