Pistachio

The tree grows up to {{convert|10|m|abbr=off|frac=2}} tall. It has deciduous, pinnate leaves {{convert|10–20|cm|abbr=off|frac=2}} long. The plants are dioecious, with separate male and female trees. The flowers are apetalous and unisexual and borne in panicles.{{Cite book |last=Considine |first=Douglas M. |title=Van Nostrand’s Scientific Encyclopedia |last2=Considine |first2=Glenn D. |date=1995 |publisher=Springer US |isbn=978-1-4757-6918-0 |edition=8th |location=Boston, MA s.l |pages=556}}

alt=Pistachio, [[Torbat-e Heydarieh, Razavi Khorasan, Iran|thumb|Pistachio]]

The fruit is a drupe, containing an elongated seed, which is the edible portion. The seed, commonly thought of as a nut, is a culinary nut, not a botanical nut. The fruit has a hard, cream-colored exterior shell. The seed has a mauve-colored skin and light green flesh, with a distinctive flavor. When the fruit ripens, the shell changes from green to an autumnal yellow/red and abruptly splits partly open. This is known as dehiscence and happens with an audible pop. Humans selected the trait of splitting open.[http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.111.5856&rep=rep1&type=pdf#page=35 Towards a comprehensive documentation and use of Pistacia genetic diversity in Central and West Asia, North Africa and Europe], Report of the IPGRI Workshop, 14–17 December 1998, Irbid, Jordan – S.Padulosi and A. Hadj-Hassan, editors Commercial cultivars vary in how consistently they split open.

Each mature pistachio tree averages around {{convert|50|kg|abbr=off}} of seeds, or around 50,000 seeds, every two years.{{cite book |last=Nugent |first=Jeff |title=Permaculture Plants: A Selection |author2=Julia Boniface |date=30 March 2005 |publisher=Permanent Publications |isbn=978-1856230292 |page=41 |chapter=Pistachio Nuts |chapter-url=https://books.google.com/books?id=40n-Z_8ihZMC&pg=PA41}}

Pistachio is from late Middle English pistace, from Old French, superseded in the 16th century by forms from Italian pistacchio, via Latin from Greek {{lang|grc|πιστάκιον}} pistákion, and from Middle Persian pistakē.{{Citation |title=pistachio, n. & adj. |date=2023-03-02 |work=Oxford English Dictionary |url=http://dx.doi.org/10.1093/oed/7304444088 |access-date=2024-09-29 |publisher=Oxford University Press|doi=10.1093/oed/7304444088 }}

File:Feuilles de pistachier.jpg]]Pistachio is a desert plant and is highly tolerant of saline soil. It has been reported to grow well when irrigated with water having 3,000–4,000 ppm of soluble salts.Esteban Herrera (1997) Growing pistachios in New Mexico, New Mexico State University, Cooperative Extension Service, Circular 532 [http://aces.nmsu.edu/pubs/_circulars/circ532.pdf] Pistachio trees are fairly hardy in the right conditions and can survive temperatures ranging between {{convert|-10|C|F}} in winter and {{convert|118|F|C|order=flip}} in summer. They need a sunny position and well-drained soil. Pistachio trees do poorly in high humidity conditions and are susceptible to root rot in winter if they get too much water and the soil is not sufficiently free-draining.{{Cite web |last=Michailides |first=T.J. |date=October 2014 |title=Phytophthora Root and Crown Rot |url=https://ipm.ucanr.edu/agriculture/pistachio/phytophthora-root-and-crown-rot/#gsc.tab=0 |access-date=September 27, 2024 |website=UCIPM}} Long, hot summers are required for proper ripening of the fruit.{{citation needed|date=June 2023}}

File:Dormant Pistachios in California.jpg growing in California|thumb|Dormant pistachio trees, California]]

The pistachio tree may live up to 300 years.{{Cite web |url=http://www.infoagro.com/frutas/frutos_secos/pistacho.htm |title=Pistachio cultivation (translated) |website=www.infoagro.com |date=18 March 2019}} The trees are planted in orchards, and take around 7 to 10 years to reach significant production. Production is alternate-bearing or biennial-bearing, meaning the harvest is heavier in alternate years. Peak production is reached around 20 years. Trees are usually pruned to size to make the harvest easier. One male tree produces enough pollen for 8 to 12 drupe-bearing females. Harvesting in the United States and Greece is often accomplished using equipment to shake the drupes off the tree. After hulling and drying, pistachios are sorted according to open-mouth and closed-mouth shells, then roasted or processed by special machines to produce pistachio kernels.{{citation needed|date=June 2023}}

The pistachio tree is native to Afghanistan, Iran and Central Asia.{{Cite book |last=Marks |first=Gil |url=https://books.google.com/books?id=gFK_yx7Ps7cC&pg=PT1 |title=Encyclopedia of Jewish Food |date=2010 |publisher=HMH |isbn=978-0544186316 |language=en |quote=These pale green nuts covered with a papery skin grow on a small deciduous tree native to Persia, the area that still produces the best pistachios.}}{{Cite web |title=Pistacia vera L. {{!}} Plants of the World Online {{!}} Kew Science |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:70280-1 |access-date=24 May 2019 |website=Plants of the World Online}}{{Cite web |title=Pistachio {{!}} Description, Uses, & Nutrition |url=https://www.britannica.com/plant/pistachio-plant |access-date=24 May 2019 |website=Encyclopedia Britannica |language=en |quote=The pistachio tree is believed to be indigenous to Iran.}}{{Cite journal |last=V. Tavallali and M. Rahemi |date=2007 |title=Effects of Rootstock on Nutrient Acquisition by Leaf, Kernel and Quality of Pistachio (Pistacia vera L.) |url=http://pdfs.semanticscholar.org/53e4/b0db43473510e6cbadb0b076bb77791f498a.pdf |url-status=dead |journal=American-Eurasian J. Agric. & Environ. Sci. |volume=2 |issue=3 |pages=240–246 |s2cid=7346114 |archive-url=https://web.archive.org/web/20190224061521/http://pdfs.semanticscholar.org/53e4/b0db43473510e6cbadb0b076bb77791f498a.pdf |archive-date=24 February 2019 |quote=Native P. vera forests are located in north eastern part of Iran particularly in Sarakhs region. This native P. vera originates from cultivated pistachio trees in Iran [1]. P. mutica is a wild species indigenous to Iran that grows with almonds, oak, and other forest trees and is common to most Alpine regions.}}

Archaeological evidence shows that pistachio seeds were a common food as early as 6750 BCE.{{cite web |title=History and Agriculture of the Pistachio Nut |url=http://www.ireco.lu/UK/pistachionut.html |url-status=dead |archive-url=https://web.archive.org/web/20060708221932/http://www.ireco.lu/UK/pistachionut.html |archive-date=8 July 2006 |access-date=27 February 2012 |publisher=IRECO}} The earliest archeological evidence of pistachio consumption goes back to the Bronze Age Central Asia and comes from Djarkutan, modern Uzbekistan.{{cite book |author=D. T. Potts |url=https://books.google.com/books?id=7lK6l7oF_ccC&pg=PA199 |title=A Companion to the Archaeology of the Ancient Near East, Volume 1 |date=21 May 2012 |publisher=John Wiley & Sons |isbn=978-1405189880 |page=199}}{{cite book |author=Harlan Walker |url=https://books.google.com/books?id=lpOqTUucwhUC&pg=PA84 |title=Cooks and Other People |publisher=Oxford Symposium |year=1996 |isbn=978-0907325727 |page=84}}

The Romans introduced pistachio trees from Asia to Europe in the first century AD. They are cultivated across Southern Europe and North Africa.Davidson (1999) Oxford Companion to food, Oxford University Press

Theophrastus described it as a terebinth-like tree with almond-like nuts from Bactria.{{Cite book |last=Theophrastus |title=Enquiry into Plants |publisher=William Heinemann |others=Translated by Sir Arthur Hort |year=1916 |volume=1 |location=London |pages=317}}

It appears in Dioscorides' writings as pistákia (πιστάκια), recognizable as P. vera by its comparison to pine nuts.James Strong, ed. Cyclopaedia of Biblical, Theological, and Ecclesiastical Literature, s.v. "Nut".

Pliny the Elder wrote in his Natural History that pistacia, "well known among us", was one of the trees unique to Syria, and that the seed was introduced into Italy by the Roman proconsul in Syria, Lucius Vitellius the Elder (in office in 35 AD), and into Hispania at the same time by Flaccus Pompeius.Pliny's Natural History, xiii.10.5, xv.22.

The manuscript De observatione ciborum (On the Observance of Foods) by Anthimus,{{cite Q |Q130283165 |mode=cs1 }} from the early sixth century, implies that pistacia remained well-known in Europe in late antiquity.

An article on pistachio tree cultivation was brought down in Ibn al-'Awwam's 12th-century agricultural work, Book on Agriculture.{{cite book |last=Ibn al-'Awwam |first=Yaḥyá |url=https://archive.org/details/lelivredelagric00algoog/page/n14/mode/2up |title=Le livre de l'agriculture d'Ibn-al-Awam (kitab-al-felahah) |publisher=A. Franck |year=1864 |location=Paris |pages=245–248 (ch. 7 – Article 14) |language=fr |translator=J.-J. Clement-Mullet |oclc=780050566 |author-link=Ibn al-'Awwam}} (pp. 245–248 (Article XIV)

Archaeologists have found evidence from excavations at Jarmo in northeastern Iraq for the consumption of Atlantic pistachio.

The Hanging Gardens of Babylon were said to have contained pistachio trees during the reign of King Marduk-apla-iddina II about 700 BCE.

In the 19th century, the pistachio was cultivated commercially in parts of the English-speaking world, such as Australia and in the US in New Mexico and California, where it was introduced in 1854 as a garden tree.{{Cite web |last=Rieger |first=Mark |date=2012 |title=Pistachio – pistacia vera |url=http://www.uga.edu/fruit/pistachio-pistacia-vera/ |url-status=dead |archive-url=https://archive.today/20141030171646/http://www.uga.edu/fruit/pistachio-pistacia-vera/ |archive-date=30 October 2014 |access-date=2023-01-16 |website=Mark's Fruit Crops |publisher=University of Georgia}}

In 1904 and 1905, David Fairchild of the United States Department of Agriculture introduced hardier cultivars to California collected from China, but it was not promoted as a commercial crop until 1929.{{Cite book |last=Fairchild |first=David |url=https://archive.org/details/worldwasmygarden00fair |title=The World Was My Garden |publisher=Charles Scribner's Sons |year=1938 |isbn=068684310X |location=New York |page=[https://archive.org/details/worldwasmygarden00fair/page/174 174] |author-link=David Fairchild |url-access=registration}}; Commissioner of Horticulture of the State of California,Biennial report1905/06, vol. II:392. Walter T. Swingle's pistachios from Syria had already fruited well at Niles, California, by 1917.Liberty Hyde Bailey, Cyclopedia of American Agriculture: II.Crops, 1917, s.v."Importance of plant introduction" p. {{page needed|date=September 2022}}

In 1969 and 1971, changes to the tax code in the United States eliminated tax shelters for almonds and citrus fruits. That encouraged California farmers to plant pistachio trees because they were still eligible for such tax breaks. In 1972, the Shah of Iran began a school breakfast program that included packets of pistachios. This resulted in a decline in pistachio exports from Iran, resulting in increased prices in other countries and additional incentives to plant pistachio trees in California.{{cite news |last=Blackburn |first=Mark |date=October 3, 1979 |title=California Pistachios With Perfect Timing |language= |pages= |newspaper=New York Times |publisher= |location= |url=https://nyti.ms/1H8l3ng |accessdate=February 21, 2023}} The first commercial pistachio harvest in California took place in 1976.{{cite news |last=Durkin |first=Andrea |date=April 14, 2020 |title=Pistachios: The Quirks of Agricultural Trade in a Nutshell |language= |pages= |newspaper=Global Trade |publisher= |location= |url=https://www.globaltrademag.com/pistachios-the-quirks-of-agricultural-trade-in-a-nutshell/ |accessdate=February 21, 2023}} The Shah was forced into exile in January 1979 during the Iranian Revolution, resulting in an end to trade between the United States and Iran, providing additional incentives for American farmers to plant dramatically more pistachio trees.

By 2008, U.S. pistachio production rivaled that of Iran. Drought and cold weather in Iran led to severe declines in production, while U.S. production was increasing. At that time, pistachios were Iran's second-most important export product, after the oil and gas sector.{{cite news |last=Dahl |first=Frederick |date=October 8, 2008 |title=Iran faces U.S. challenge in "pistachio war" |language= |pages= |newspaper=Reuters |publisher= |location= |url=https://www.reuters.com/article/us-iran-pistachios/iran-faces-u-s-challenge-in-pistachio-war-idUSTRE49806E20081009 |accessdate=February 21, 2023}}

By 2020, there were 150,000 pistachio farmers in Iran, approximately 70% of whom were small-scale producers using inefficient manual picking and processing techniques. There were 950 far larger U.S. producers, using highly efficient mechanized production techniques. The U.S. and Iran control 70% of the world export market, with the U.S. in the lead. Worldwide demand exceeds production, so both countries can sell to various export markets.

In 2021, Fresno County, California, accounted for about 40% of U.S. pistachio production, with a value of $722 million.{{cite news |last=Fitchette |first=Todd |date=October 28, 2022 |title=Fresno leads nation in almond, pistachio production: The county amassed a record value of just over $8 billion last year. |language= |pages= |newspaper=Farm Progress |publisher= |location= |url=https://www.farmprogress.com/tree-nuts/fresno-leads-nation-in-almond-pistachio-production |accessdate=February 21, 2022}}

{{See also|List of pistachio diseases}}

Pistachio trees are vulnerable to numerous diseases and infestation by insects such as Leptoglossus clypealis in North America.{{Cite journal |last=Bolkan |first=Hasan |date=1 March 1984 |title=Leaf-footed bug implicated in pistachio epicarp lesion |url=http://calag.ucanr.edu/archive/?article=ca.v038n03p16 |journal=California Agriculture |volume=38 |pages=16–17 |access-date=2 August 2018 |archive-date=19 April 2022 |archive-url=https://web.archive.org/web/20220419102950/https://calag.ucanr.edu/archive/?article=ca.v038n03p16 |url-status=dead }} Among these is infection by the fungus Botryosphaeria, which causes panicle and shoot blight (symptoms include death of the flowers and young shoots), and can damage entire pistachio orchards.{{cite journal |last1=Parfitt |first1=D.E. |last2=Arjmand |first2=N. |last3=Michailides |first3=T.J. |date=July 2003 |title=Resistance to Botryosphaeria dothidea in pistachio |journal=HortScience |volume=38 |issue=4 |page=529 |doi=10.21273/HORTSCI.38.4.529 |doi-access=free}} In 2004, the rapidly growing pistachio industry in California was threatened by panicle and shoot blight first discovered in 1984.{{cite web |date=12 January 2004 |title=California Pistachio Industry Threatened By Potentially Devastating Disease |url=https://www.sciencedaily.com/releases/2004/01/040112071931.htm |access-date=9 March 2017 |website=ScienceDaily}} In 2011, anthracnose fungus caused a sudden 50% loss in the Australian pistachio harvest.{{cite web |author=Keim, Brandon |date=26 April 2011 |title=Australia Pistachio Disaster Hints at Agricultural Breakdown |url=https://www.wired.com/2011/04/pistachio-disease/ |access-date=9 March 2017 |publisher=Wired Magazine-Science}} Several years of severe drought in Iran around 2008 to 2015 caused significant declines in production.{{cite news |author=Erdbrink, Thomas |date=18 December 2015 |title=Scarred Riverbeds and Dead Pistachio Trees in a Parched Iran |newspaper=The New York Times |url=https://www.nytimes.com/2015/12/19/world/middleeast/scarred-riverbeds-and-dead-pistachio-trees-in-a-parched-iran.html |access-date=9 March 2017}}

In 2022, world production of pistachios was {{convert|1|e6t|e9lb|abbr=off|spell=in}}, with the United States, Iran, and Turkey together accounting for 88% of the total (table).

Italy produces a low quantity of pistachios, with the Pistacchio di Bronte (pistachios from Bronte town) DOP-protected.{{cite web|url=https://www.bronteinsieme.it/4ec/pist_5dop.html|title="Pistacchio verde di Bronte" - La Denominazione di Origine Protetta}}

As with other tree seeds, aflatoxin is found in poorly harvested or processed pistachios. Aflatoxins are potent carcinogenic chemicals produced by molds such as Aspergillus flavus and A. parasiticus. The mold contamination may occur from soil or poor storage and be spread by pests. High levels of mold growth typically appear as gray to black filament-like growth. Eating mold-infected and aflatoxin-contaminated pistachios is unsafe.{{cite web |author=E. Boutrif |year=1998 |title=Prevention of aflatoxin in pistachios |url=https://nootropicsfrontline.com/wp-content/uploads/2021/07/wiki_Prevention-of-aflatoxin-in-pistachios.pdf |url-status=live |archive-url=https://ghostarchive.org/archive/20221009/https://nootropicsfrontline.com/wp-content/uploads/2021/07/wiki_Prevention-of-aflatoxin-in-pistachios.pdf |archive-date=2022-10-09 |publisher=FAO, United Nations}} Aflatoxin contamination is a frequent risk, particularly in warmer and humid environments. Food contaminated with aflatoxins has caused frequent outbreaks of acute illnesses in parts of the world. In some cases, such as in Kenya, this has led to several deaths.{{cite web |year=2008 |title=Aflatoxins in pistachios |url=http://ec.europa.eu/dgs/jrc/downloads/jrc_irmm_aflatoxins_leaflet.pdf |url-status=live |archive-url=https://ghostarchive.org/archive/20221009/http://ec.europa.eu/dgs/jrc/downloads/jrc_irmm_aflatoxins_leaflet.pdf |archive-date=2022-10-09 |publisher=European Union}}

Pistachio shells typically split naturally before harvest, with a hull covering the intact seeds. The hull protects the kernel from invasion by molds and insects, but this hull protection can be damaged in the orchard by poor orchard management practices, by birds, or after harvest, which makes exposure to contamination much easier. Some pistachios undergo a so-called "early split", wherein both the hull and the shell split. Damage or early splits can lead to aflatoxin contamination.{{cite journal |author=Doster and Michailides |year=1994 |title=Aspergillus Moulds and Aflatoxins in Pistachio Nuts in California |journal=Phytopathology |volume=84 |issue=6 |pages=583–590 |doi=10.1094/phyto-84-583}} In some cases, a harvest may be treated to keep contamination below strict food safety thresholds; in other cases, an entire batch of pistachios must be destroyed because of aflatoxin contamination.

Like other members of the family Anacardiaceae (which includes poison ivy, sumac, mango, and cashew), pistachios contain urushiol, an irritant that can cause allergic reactions.{{cite book |last=Mabberley |first=D. J. |url=https://archive.org/details/plantbookportabl0000mabb/page/27 |title=The Plant Book |publisher=Cambridge Univ. Press |year=1993 |isbn=0521340608 |location=Cambridge |page=[https://archive.org/details/plantbookportabl0000mabb/page/27 27] |url-access=registration}}

File:Turkish delight large.jpg]]

Large quantities of pistachios are self-heating in the presence of moisture due to their high oil content in addition to naturally occurring lipases, and can spontaneously combust if stored with a combustible fabric such as jute.{{cite web |title=Pistachio Nuts – RF Self-heating / Spontaneous combustion |url=https://www.tis-gdv.de/tis_e/ware/nuesse/pistazie/pistazie.htm/#selbsterhitzung |access-date=2007-11-05 |website=tis-gdv.de |publisher=The German Insurance Association}}

The kernels are often eaten whole, either fresh or roasted and salted, and are also used in pistachio ice cream, traditional Persian ice cream, kulfi, spumoni, pistachio butter,{{cite journal |last1=Ardekani |first1=A. S. H. |last2=Shahedi |first2=M. |last3=Kabir |first3=G. |year=2009 |title=Optimizing Formulation of Pistachio Butter Production |journal=Journal of Science and Technology of Agriculture and Natural Resources |volume=13 |issue=47 |pages=49–59 |url=http://journals.iut.ac.ir/emag/jstnar/eabsv13n47y2009p60.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110819040318/http://journals.iut.ac.ir/emag/jstnar/eabsv13n47y2009p60.pdf |archive-date=19 August 2011}}{{cite book |last1=Ardakani |last2=Shahedi |first2=M. |last3=Kabir |first3=G. |year=2006 |title=Optimizing of the process of pistachio butter production |series=Acta Horticulturae |volume=726 |pages=565–568 |url=http://www.pubhort.org/actahort/books/726/726_94.htm |access-date=4 May 2011 |archive-date=3 April 2013 |archive-url=https://web.archive.org/web/20130403192040/http://www.pubhort.org/actahort/books/726/726_94.htm |url-status=dead }} pistachio paste,{{cite journal |last1=Shakerardekani |first1=A. |last2=Karim |first2=R. |last3=Mohd Ghazali |first3=H. |last4=Chin |first4=N. L. |year=2011 |title=Effect of roasting conditions on hardness, moisture content and colour of pistachio kernels |journal=International Food Research Journal |volume=18 |pages=704–710 |url=http://www.ifrj.upm.edu.my/18%20(02)%202011/(35)%20IFRJ-2010-286.pdf }} and confections such as baklava, pistachio chocolate,{{cite book |last=Ardakani |year=2006 |title=The vital role of pistachio processing industries in development of Iran non-oil exports |series=Acta Horticulturae |volume=726 |pages=579–581 |url=http://www.pubhort.org/actahort/books/726/726_97.htm |access-date=4 May 2011 |archive-date=3 April 2013 |archive-url=https://web.archive.org/web/20130403140403/http://www.pubhort.org/actahort/books/726/726_97.htm |url-status=dead }} pistachio halva,{{cite journal |last1=Shaker Ardakai |first1=A. |last2=Mir Damadiha |first2=F. |last3=Salehi |first3=F. |last4=Shahedi |first4=M. |last5=Kabir |first5=G. H. |last6=Javan Shah |first6=A. |year=2007 |title=Pistachio Halva Production |publisher=Iran Pistachio Research Institute |journal=Document Number: 29328 |url=http://agris.fao.org/agris-search/search/display.do?f=2009%2FIR%2FIR0901.xml%3BIR2008001687 |display-authors=etal |access-date=4 May 2011 |archive-date=31 December 2018 |archive-url=https://web.archive.org/web/20181231143649/http://agris.fao.org/agris-search/search/display.do?f=2009%2FIR%2FIR0901.xml%3BIR2008001687 |url-status=dead }} pistachio lokum or biscotti, and cold cuts such as mortadella. Americans make pistachio salad, which includes fresh pistachios or pistachio pudding, whipped cream, and canned fruit.{{cite web|url=http://www.recipesource.com/fgv/salads/18/rec1881.html |title=Pistachio Salad |publisher=RecipeSource |access-date=17 January 2011}} Indian cooking uses pounded pistachios with grilled meats, and in pulao rice dishes.

The shell of the pistachio is naturally a beige color, but it may be dyed red or green in commercial pistachios. Originally, dye was applied to hide stains on the shells caused when the nuts were picked by hand.{{cite news |author=Spiegel, Alison |date=2 February 2015 |title=Remember Red Pistachios? Here's What Happened To Them |work=The Huffington Post |url=https://www.huffpost.com/entry/what-are-red-pistachios_n_6570944 |url-status=live |access-date=9 December 2023 |archive-url=https://web.archive.org/web/20190916012043/https://www.huffpost.com/entry/what-are-red-pistachios_n_6570944 |archive-date=16 September 2019}} In the 21st century, most pistachios are harvested by machine and the shells remain unstained.

{{nutritional value

| name = Pistachio nuts, raw

| kJ = 2351

| protein = 20.27 g

| fat = 45.39 g

| satfat = 5.556 g

| monofat = 23.820 g

| polyfat = 13.744 g

| carbs = 27.51 g

| fiber = 10.3 g

| sugars = 7.66 g

| iron_mg = 3.92

| manganese_mg = 1.2

| calcium_mg = 105

| magnesium_mg = 121

| phosphorus_mg = 490

| potassium_mg = 1025

| zinc_mg = 2.2

| thiamin_mg = 0.87

| riboflavin_mg = 0.160

| niacin_mg = 1.300

| pantothenic_mg = 0.52

| vitB6_mg = 1.700

| folate_ug = 51

| vitC_mg = 5.6

| vitD_ug = 0

| vitE_mg = 2.3

| vitK_ug =13.2

| lutein_ug = 1205

| water=4 g

| source_usda = 1

| note = [https://fdc.nal.usda.gov/fdc-app.html#/food-details/170184/nutrients Link to USDA database entry]

}}

Raw pistachios are 4% water, 45% fat, 28% carbohydrates, and 20% protein (table). In a 100-gram reference amount, pistachios provide {{convert|2351|kJ|kcal}} of food energy. They are a rich source (20% or more of the Daily Value or DV) of protein, dietary fiber, several dietary minerals, and the B vitamins thiamin (73% DV) and vitamin B₆ (100% DV) (table). Pistachios are a moderate source (10–19% DV) of riboflavin, vitamin B₅, folate, vitamin E, and vitamin K (table).

The fat profile of raw pistachios consists mainly of monounsaturated fats and polyunsaturated fats, with a small amount of saturated fats (table). Saturated fatty acids include palmitic acid (10% of total) and stearic acid (2%) (table). Oleic acid is the most common monounsaturated fatty acid (52% of total fat). and linoleic acid, a polyunsaturated fatty acid, is 30% of total fat. Relative to other tree nuts, pistachios have a lower amount of fat and food energy, but higher amounts of potassium, vitamin K, γ-tocopherol, and certain phytochemicals such as carotenoids, and phytosterols.{{cite journal|last1=Bulló|first1=M|last2=Juanola-Falgarona|first2=M|last3=Hernández-Alonso|first3=P|last4=Salas-Salvadó|first4=J|title=Nutrition attributes and health effects of pistachio nuts|journal=The British Journal of Nutrition|date=April 2015|volume=113|issue=Supplement 2|pages=S79–93|doi=10.1017/S0007114514003250|pmid=26148925|type=Review |doi-access=free}}{{cite journal|last1=Dreher|first1=ML|title=Pistachio nuts: composition and potential health benefits|journal=Nutrition Reviews|date=April 2012|volume=70|issue=4|pages=234–240|doi=10.1111/j.1753-4887.2011.00467.x|pmid=22458696|type=Review|doi-access=free}}

In July 2003, the United States Food and Drug Administration approved the first qualified health claim specific to consumption of seeds (including pistachios) to lower the risk of heart disease: "Scientific evidence suggests but does not prove that eating {{convert|1.5|oz|g|1}} per day of most nuts, such as pistachios, as part of a diet low in saturated fat and cholesterol may reduce the risk of heart disease".{{cite web |url=http://www.cfsan.fda.gov/~dms/qhcnuts2.html |archive-url=https://web.archive.org/web/20080617172958/http://www.cfsan.fda.gov/~dms/qhcnuts2.html |archive-date=17 June 2008 |title=Qualified Health Claims: Letter of Enforcement Discretion – Nuts and Coronary Heart Disease (Docket No 02P-0505) |access-date=17 June 2008 |author=Office of Nutritional Products, Labeling and Dietary Supplements |date=23 July 2003 |publisher=Center for Food Safety and Applied Nutrition}} Although a typical serving of pistachios supplies substantial food energy (nutrition table), their consumption in normal amounts is not associated with weight gain or obesity.

One review found that pistachio consumption lowered blood pressure in persons without diabetes mellitus.{{cite journal|last1=Mohammadifard|first1=N|last2=Salehi-Abargouei|first2=A|last3=Salas-Salvadó|first3=J|last4=Guasch-Ferré|first4=M|last5=Humphries|first5=K|last6=Sarrafzadegan|first6=N|title=The effect of tree nut, peanut, and soy nut consumption on blood pressure: a systematic review and meta-analysis of randomized controlled clinical trials|journal=The American Journal of Clinical Nutrition|date=May 2015|volume=101|issue=5|pages=966–982|doi=10.3945/ajcn.114.091595|pmid=25809855|type=Systematic Review & Meta-Analysis|doi-access=free}} A 2021 review found that pistachio consumption for three months or less significantly reduced triglyceride levels.{{cite journal |last1=Muley |first1=Arti |title=Effect of tree nuts on glycemic outcomes in adults with type 2 diabetes mellitus: a systematic review |journal=JBI Evidence Synthesis |date=2021 |volume=19 |issue=5 |pages=966–1002 |doi=10.11124/JBISRIR-D-19-00397 |pmid=33141798|s2cid=226250006 }}

• List of culinary nuts
• Pistacia lentiscus

{{Reflist|30em}}

{{Commons|Pistacia vera|Pistachio}}

{{Wiktionary|pistachio}}

{{Cookbook}}

• {{Cite EB1911|wstitle=Pistachio Nut}}

{{Nuts}}

{{Taxonbar|from=Q36071}}

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Category:Pistacia

Category:Edible nuts and seeds

Category:Flora of Central Asia

Category:Flora of Western Asia

Category:Fruit trees

Category:Trees of Mediterranean climate

Category:Italian cuisine

Category:Plants described in 1753

Category:Drupes

Category:Symbols of California