Kosher Diet

Kashrut (also kashruth or kashrus, כַּשְׁרוּת‬) is a set of Jewish religious dietary laws. Food that may be consumed according to halakha (Jewish law) is termed kosher (/ˈkʃər/ in English, Yiddish: כּשר‎), from the Ashkenazi pronunciation of the Hebrew term kashér (כָּשֵׁר‬), meaning “fit” (in this context, fit for consumption).

Among the numerous laws that form kashrut are prohibitions on the consumption of certain animals (such as pork and shellfish), mixtures of meat and milk, and the commandment to slaughter mammals and birds according to a process known as shechita. There are also laws regarding agricultural produce that might impact the suitability of food for consumption.

Most of the basic laws of kashrut are derived from the Torah’s Books of Leviticus and Deuteronomy. Their details and practical application, however, are set down in the oral law (eventually codified in the Mishnah and Talmud) and elaborated on in the later rabbinical literature. Although the Torah does not state the rationale for most kashrut laws, some suggest that they are only tests for man’s obedience,[1] while others have suggested philosophical, practical and hygienic reasons.[2]

Over the past century, many rabbinical organizations have started to certify products, manufacturers, and restaurants as kosher, usually using a symbol (called a hechsher) to indicate their support. Currently, about a sixth of American Jews or 0.3% of the American population fully keep kosher, and there are many more who do not strictly follow all the rules but still abstain from some prohibited foods (especially pork). The Seventh-day Adventist Church, a Christian denomination, have a health message that expects adherence to the kosher dietary laws.[3][4][page needed]


  • 1Explanations
    • 1.1Philosophical
    • 1.2Medical
  • 2Prohibited foods
    • 2.1Permitted and forbidden animals
    • 2.2Separation of meat and milk
    • 2.3Kosher slaughter
      • 2.3.1Preparation of meats
    • 2.4Kosher utensils
    • 2.5Passover laws
    • 2.6Produce of the Land of Israel
    • 2.7Vegetables
    • 2.8Pareve foods
    • 2.9Genetically modified foods
  • 3Supervision and marketing
    • 3.1Hashgacha
    • 3.2Product labeling standards
    • 3.3History of kosher supervision and marketing
    • 3.4Legal usage
    • 3.5Costs
  • 4Society and culture
    • 4.1Adherence
    • 4.2Linguistics
  • 5See also
  • 6References
  • 7Further reading
  • 8External links

Jewish philosophy divides the 613 commandments (or mitzvot) into three groups—laws that have a rational explanation and would probably be enacted by most orderly societies (mishpatim), laws that are understood after being explained but would not be legislated without the Torah’s command (edot), and laws that do not have a rational explanation (chukim). Some Jewish scholars say that kashrut should be categorized as laws for which there is no particular explanation, since the human mind is not always capable of understanding divine intentions. In this line of thinking, the dietary laws were given as a demonstration of God’s authority, and man must obey without asking why.[5] However, Maimonides believed that Jews were permitted to seek out reasons for the laws of the Torah.[6]

Some theologians have said that the laws of kashrut are symbolic in character: Kosher animals represent virtues, while non-kosher animals represent vices. The 1st century BCE Letter of Aristeas argues that the laws “have been given … to awake pious thoughts and to form the character”.[7] This view reappears in the work of the 19th century Rabbi Samson Raphael Hirsch.[8]

The Torah prohibits “seething the kid (goat, sheep, calf) in its mother’s milk”. While the Bible does not provide a reason, it has been suggested that the practice was perceived as cruel and insensitive.[9][10]

Hasidic Judaism believes that everyday life is imbued with channels connecting with Divinity, the activation of which it sees as helping the Divine Presence to be drawn into the physical world;[11] Hasidism argues that the food laws are related to the way such channels, termed sparks of holiness, interact with various animals. These sparks of Holiness are released whenever a Jew manipulates any object for a holy reason (which includes eating);[12] however, not all animal products are capable of releasing their sparks of holiness.[13] The Hasidic argument is that animals are imbued with signs that reveal the release of these sparks, and the signs are expressed in the biblical categorization of ritually clean and ritually unclean.[14]

According to Christian theologian Gordon J. Wenham, the purpose of kashrut was to help Jews maintain a distinct and separate existence from other peoples; he says that the effect of the laws was to prevent socialization and intermarriage with non-Jews, preventing Jewish identity from being diluted.[15] Wenham argued that since the impact of the food laws was a public affair, this would have enhanced Jewish attachment to them as a reminder of their distinct status as Jews.[15]

There have been attempts to provide empirical support for the view that Jewish food laws have an overarching health benefit or purpose, one of the earliest being from Maimonides in The Guide for the Perplexed. In 1953, David Macht, an Orthodox Jew and proponent of the theory of biblical scientific foresight, conducted toxicityexperiments on many kinds of animals and fish.[16] His experiment involved lupin seedlings being supplied with extracts from the meat of various animals; Macht reported that in 100% of cases, extracts from ritually unclean meat inhibited the seedling’s growth more than that from ritually clean meats.[17] At the same time, these explanations are controversial. Scholar Lester L. Grabbe, writing in the Oxford Bible Commentary on Leviticus, says “[a]n explanation now almost universally rejected is that the laws in this section [18] have hygiene as their basis. Although some of the laws of ritual purity roughly correspond to modern ideas of physical cleanliness, many of them have little to do with hygiene. For example, there is no evidence that the ‘unclean’ animals are intrinsically bad to eat or to be avoided in a Mediterranean climate, as is sometimes asserted.”[19]

Kosher meal approved by the Beth din of Johannesburg

The laws of kashrut can be classified according to the origin of the prohibition (Biblical or rabbinical) and whether the prohibition concerns the food itself or a mixture of foods.[20]

Biblically prohibited foods include:[20]

  • Non-kosher animals and birds:[21][22] mammals require certain identifying characteristics (cloven hooves and being ruminants), while birds require a tradition that they can be consumed. Fish require scales and fins (thus excluding catfish, for instance). All invertebrates are non-kosher apart from certain types of locust, on which most communities lack a clear tradition. No reptilesor amphibians are kosher.
  • Carrion (nevelah): meat from a kosher animal that has not been slaughtered according to the laws of shechita. This prohibition includes animals that have been slaughtered by non-Jews.[23]
  • Injured (terefah): an animal with a significant defect or injury, such as a fractured bone or particular types of lung adhesions.
  • Blood (dam): blood of kosher mammals and fowl is removed through salting, with special procedures for the liver, which is very rich in blood.
  • Particular fats (chelev): particular parts of the abdominal fat of cattle, goats and sheep must be removed by a process called nikkur.
  • The twisted nerve (gid hanasheh): the sciatic nerve, as according to Genesis 32:32 the patriarch Jacob’s was damaged when he fought with an angel, cannot be eaten and is removed by nikkur.
  • Limb of a living animal (ever min ha-chai):[24] God forbade Noah and his descendants to consume a limb torn from a live animal. Hence, Jewish law considers this prohibition applicable even to non-Jews,[25] and therefore, a Jew may not give or sell such meat to a non-Jew.
  • Untithed food (tevel): produce of the Land of Israel requires the removal of certain tithes, which in ancient times were given to the Kohanim (priests), Levites and the poor (terumah, maaser rishon and maaser ani respectively) or taken to the Old City of Jerusalem to be eaten there (maaser sheni).
  • Fruit during the first three years (orlah): according to Leviticus 19:23,[26] fruit from a tree in the first three years after planting cannot be consumed (both in the Land of Israel and the diaspora). This applies also to the fruit of the vine—grapes, and wine produced from them.[27]
  • New grain (chadash):[28] the Bible prohibits newly grown grain (planted after Passover the previous year) until the second day of Passover; there is debate as to whether this law applies to grain grown outside the Land of Israel.
  • Wine of libation (yayin nesekh): wine that may have been dedicated to idolatrous practices.

Biblically prohibited mixtures include:[20]

  • Mixtures of meat and milk[29][30][31](basar be-chalav): this law derives from the broad interpretation of the commandment not to “cook a kid in its mother’s milk”;[32][33][34] other non-kosher food may be used for other benefit (e.g. sold to non-Jews), but mixtures of meat and milk are prohibited even with regards to other benefit.[citation needed]
  • Plants grown together (kilayim): in the Land of Israel plants are to be grown separately and not in close proximity according to Leviticus 19:19 and Deuteronomy 22:9–11. A specific subdivision of this law is kil’ei ha-kerem, the prohibition of planting any grain or vegetable near a grapevine; this law applies to Jews throughout the world, and one may not derive benefit from the produce.

Rabbinically prohibited foods include:[20]

  • Non-Jewish milk (chalav akum): milk that may have an admixture of milk from non-kosher animals (see below for current views on this prohibition).
  • Non-Jewish cheese (gevinat akum): cheese that may have been produced with non-kosher rennet.
  • Non-Jewish wine (stam yeinam): wine that while not produced for idolatrous purposes may otherwise have been poured for such a purpose or alternatively when consumed will lead to intermarriage.
  • Food cooked by a non-Jew (bishul akum): this law was enacted for concerns of intermarriage.
  • Non-Jewish bread (pat akum): this law was enacted for concerns of intermarriage.
  • Health risk (sakanah): certain foods and mixtures are considered a health risk, such as mixtures of fish and meat.

Examples of cloven hooves in goats(upper left), pigs (lower left) and cattle(lower right). But horses lack cloven hooves (upper right).

Only meat from particular species is permissible. Mammals that both chew their cud (ruminate) and have cloven hooves can be kosher. Animals with one characteristic but not the other (the camel, the hyrax, and the hare because they have no cloven hooves, and the pig because it does not ruminate) are specifically excluded.[35][36][37] In 2008, a rabbinical ruling determined that giraffes and their milk are eligible to be considered kosher. The giraffe has both split hooves and chews its cud, characteristics of animals considered kosher. Findings from 2008 show that giraffe milk curdles, meeting kosher standards. Although kosher, the giraffe is not slaughtered today because the process would be very costly. Giraffes are difficult to restrain, and their use for food could cause the species to become endangered.[38][39][40]

Non-kosher birds are listed outright[41] but the exact zoological references are disputed and some references refer to families of birds (24 are mentioned). The Mishnah[42] refers to four signs provided by the sages.[43] First, a dores (predatory bird) is not kosher. Additionally, kosher birds possess three physical characteristics: an extra toe in the back (which does not join the other toes in supporting the leg), a zefek (crop), and a korkoban (gizzard) with a peelable lumen. However, individual Jews are barred from merely applying these regulations alone; an established tradition (masorah) is necessary to allow birds to be consumed, even if it can be substantiated that they meet all four criteria. The only exception to this is turkey. There was a time when certain authorities considered the signs enough, so Jews started eating this bird without a masorah because it possesses all the signs (simanim) in Hebrew.[44]

Fish must have fins and scales to be kosher.[45] Shellfish and other non-fish water animals fauna are not kosher.[46] (See kosher species of fish.) Insects are not kosher, except for certain species of kosher locust.[47] Generally, any animal that eats other animals, whether they kill their food or eat carrion,[48] is not kosher, as well as any animal that has been partially eaten by other animals.[49]

Class Forbidden kinds
Mammals Carnivores; animals that do not chew the cud (e.g., the pig); animals that do not have cloven hooves (e.g., the camel, the hare, the horse and the hyrax)
Birds Birds of prey; scavengers
Reptiles and amphibians All
Water animals All non-fish. Among fish, all those that do not have both fins and scales
Insects All, except grasshoppers, and a particular type of locust that, according to most, cannot be identified today

Meat and milk (or derivatives) cannot be mixed[50] in the sense that meat and dairy products are not served at the same meal, served or cooked in the same utensils, or stored together. Observant Jews have separate sets of dishes, and sometimes different kitchens, for meat and milk, and wait anywhere between one and six hours after eating meat before consuming milk products.[51] The milchig and fleishig (lit. milky and meaty) utensils and dishes are the commonly referred to Yiddish delineations between dairy and meat ones, respectively.[52]

A 15th-century depiction of shechita

Mammals and fowl must be slaughtered by a trained individual (a shochet) using a special method of slaughter, shechita.[53]Among other features, shechita slaughter severs the jugular vein, carotid artery, esophagus, and trachea in a single continuous cutting movement with an unserrated, sharp knife. Failure of any of these criteria renders the meat of the animal unsuitable. The body must be checked after slaughter to confirm that the animal had no medical condition or defect that would have caused it to die of its own accord within a year, which would make the meat unsuitable.[54] These conditions (treifot) include 70 different categories of injuries, diseases, and abnormalities whose presence renders the animal non-kosher. It is forbidden to consume certain parts of the animal, such as certain fats (chelev) and the sciatic nerves from the legs, the process of excision being done by experts before the meat is sold. As much blood as possible must be removed[55] through the kashering process; this is usually done through soaking and salting the meat, but the liver, as it is rich in blood, is grilled over an open flame.[56] Fish (and kosher locusts, for those who follow the traditions permitting them) must be killed before being eaten, but no particular method has been specified in Jewish law.[57][58] Legal aspects of ritual slaughter are governed not only by Jewish law but civil law as well.

When an animal is ritually slaughtered (shechted) the raw meat is traditionally cut, rinsed and salted, prior to cooking. Salting of raw meat draws out the blood that lodges on the inner surface of the meat. Salting is made with any coarse grain of salt, while the meat is laid over a grating or colander to allow for drainage, and where the salt is allowed to remain on the meat for the duration of time that it takes to walk one biblical mile[59] (appx. 18– 24 minutes). Afterwards, the residue of salt is rinsed away with water, and the meat cooked. Meat that is roasted requires no prior salting, as fire acts as a natural purgatory of blood.

A late Commentary on the Shulchan Arukh known as the Taz (Turei Zahav), on Yoreh De’ah 69:5:16, writes that the pieces of meat can be “very thick” when salting.[60]The Yemenite Jewish practice, however, follows Rabbi Saadiah Gaon who required that the meat not be larger than half a “rotal” (i.e. ca. 216 grams) when salting.[61] This allows the effects of the salt to penetrate. Some Orthodox Jewish communities require the additional stricture of submersing raw meat in boiling water prior to cooking it, a practice known as ḥaliṭah (Hebrew: חליטה‬), “blanching.”[62] This was believed to constrict the blood lodged within the meat, to prevent its oozing out when it is eaten. The raw meat is left in the pot of boiling water for as long as it takes for the meat to whiten on its outer layer. If someone wanted to use the water for soup after making ḥaliṭahin the same pot, he simply scoops out the film, froth and scum that surface in the boiling water. Ḥaliṭah is not required when roasting meat over a fire, as the fire constricts the blood.

Kosher dairy dishes from the 19th century in the Jewish Museum, Berlin.

Utensils used for non-kosher foods become non-kosher, and make even otherwise kosher food prepared with them non-kosher. Some such utensils, depending on the material they are made from, can be made suitable for preparing kosher food again by immersion in boiling water or by the application of a blowtorch. Food prepared in a manner that violates the Shabbat (Sabbath) may not be eaten; although in certain instances it is permitted after the Shabbat is over.[63]

Label on bottle of orange juicecertifying that it is kosher for Passover.

Passover has special dietary rules, the most important of which is the prohibition on eating leavened bread or derivatives of this, which are known as chametz. This prohibition is derived from Exodus 12:15.[64] Utensils used in preparing and serving chametz are also forbidden on Passover unless they have been ritually cleansed (kashered).[65] Observant Jews often keep separate sets of meat and dairy utensils for Passover use only. In addition, some groups follow various eating restrictions on Passover that go beyond the rules of kashrut, such as not eating gebrochts[66] or garlic.[67]

Biblical rules also control the use of agriculture produce.[vague][citation needed] For produce grown in the Land of Israel a modified version of the biblical tithes must be applied, including Terumat HaMaaser, Maaser Rishon, Maaser Sheni, and Maaser Ani(untithed produce is called tevel); the fruit of the first three years of a tree’s growth or replanting are forbidden for eating or any other use as orlah;[68] produce grown in the Land of Israel on the seventh year obtains k’dushat shvi’it, and unless managed carefully is forbidden as a violation of the Shmita (Sabbatical Year). Some rules of kashrutare subject to different rabbinical opinions. For example, many hold that the rule against eating chadash (new grain) before the 16th of the month Nisan does not apply outside the Land of Israel.[69]

Many vegetarian restaurants and producers of vegetarian foods acquire a hechsher, certifying that a Rabbinical organization has approved their products as being kosher. The hechsher usually certifies that certain vegetables have been checked for insect infestation and steps have been taken to ensure that cooked food meets the requirements of bishul Yisrael.[70] Vegetables such as spinach and cauliflower must be checked for insect infestation. The proper procedure for inspecting and cleaning varies by species, growing conditions, and views of individual rabbis.[71]

Some processes convert a meat or dairy product into a pareve (neither meat nor dairy) one. For example, rennet is sometimes made from stomach linings, yet is acceptable for making kosher cheese,[72] but such cheeses might not be acceptable to some vegetarians, who would eat only cheese made from a vegetarian rennet. The same applies to kosher gelatin, an animal product, derived from kosher animal sources. Other gelatin-like products from non-animal sources such as agar agar and carrageenan are pareve by nature. Fish gelatin is derived from fish and is therefore (like all kosher fish products) pareve. Eggs are also considered pareve despite being an animal product.[73]

Kashrut has procedures by which equipment can be cleaned of its previous non-kosher use, but that might be inadequate for those with allergies, vegetarians, or adherents to other religious statutes. For example, dairy manufacturing equipment can be cleaned well enough that the rabbis grant pareve status to products manufactured with it. Nevertheless, someone with a strong allergic sensitivity to dairy products might still react to the dairy residue, and that is why some products that are legitimately pareve carry “milk” warnings.[74]

With the advent of genetic engineering, a whole new type of food has been brought into the world, and scholars in both academia and Judaic faith have differing viewpoints on whether these new strains of foods are to be considered kosher or not. The first genetically modified animal approved by the FDA for human consumption is the AquAdvantage salmon, and while salmon is normally an acceptably kosher food, this modified organism has a gene from a nonkosher organism.

Some put forth that this intermixing of species is against the teachings of the Talmud and thus against Jewish Law and nonkosher. Others argue that the one in sixty parts law of kashrut is of significance, and that the foreign gene accounts for the less than 1/60 of the animal and thus the modified salmon is kosher.[75]

A cocoon found among barleycornsin a commercially available bag of barley. Foods such as seeds, nuts and vegetables need to be checked to avoid eating insects.

Certain foods must be prepared in whole or in part by Jews. This includes grape wine,[76] certain cooked foods (bishul akum),[77]cheese (g’vinat akum), and according to some also butter (chem’at akum);[78] dairy products (Hebrew: חלב ישראל chalav Yisrael”milk of Israel”);[78][79] and bread (Pas Yisroel).[80]

The circled U indicates that this product is certified as kosher by the Orthodox Union (OU). The word “pareve” indicates that this product contains neither milk- nor meat-derived ingredients

Kosher McDonald’s in Buenos Aires, Argentina.

Although reading the label of food products can identify obviously non-kosher ingredients, some countries allow manufacturers to omit identification of certain ingredients. Such “hidden” ingredients may include lubricants and flavorings, among other additives; in some cases, for instance, the use of natural flavorings, these ingredients are more likely to be derived from non-kosher substances.[81] Furthermore, certain products, such as fish, have a high rate of mislabeling, which may result in a non-kosher fish being sold in a package labeled as a species of kosher fish.[82]

Producers of foods and food additives can contact Jewish religious authorities to have their products certified as kosher: this involves a visit to the manufacturing facilities by an individual rabbi or a committee from a rabbinic organization, who will inspect the production methods and contents, and if everything is sufficiently kosher a certificate would be issued.[83]

Manufacturers sometimes identify the products that have received such certification by adding particular graphical symbols to the label. These symbols are known in Judaism as hechsherim.[84] Due to differences in kashrut standards held by different organizations, the hechsheirim of certain Jewish authorities may at times be considered invalid by other Jewish authorities.[85] The certification marks of the various rabbis and organisations are too numerous to list, but one of the most commonly used in the United States of America is that of the Union of Orthodox Congregations, who use a U inside a circle (“O-U”), symbolising the initials of Orthodox Union. In Britain, a commonly used symbol is the “KLBD” logo of the London Beth Din.[citation needed] A single Kis sometimes used as a symbol for kosher, but since many countries do not allow letters to be trademarked (the method by which other symbols are protected from misuse), it only indicates that the company producing the product claims that it is kosher.[86]

Many of the certification symbols are accompanied by additional letters or words to indicate the category of the product, according to Jewish law;[86] the categorisation may conflict with legal classifications, especially in the case of food that Jewish law regards as dairy, but legal classification does not.

  • D—Dairy
  • DE—Dairy equipment
  • M—Meat, including poultry
  • Pareve—Food that is neither meat nor dairy
  • Fish
  • P—Passover-related (P is not used for Pareve)

In many cases constant supervision is required because, for various reasons, such as changes in manufacturing processes, products that once were kosher may cease to be so. For example, a kosher lubricating oil may be replaced by one containing tallow, which many rabbinic authorities view as non-kosher. Such changes are often co-ordinated with the supervising rabbi, or supervising organisation, to ensure that new packaging does not suggest any hechsher or kashrut. In some cases, however, existing stocks of pre-printed labels with the hechsher may continue to be used on the now non-kosher product. An active grapevine among the Jewish community discusses which products are now questionable, as well as products which have become kosher but whose labels have yet to carry the hechsher. Some newspapers and periodicals also discuss kashrut products.[87]

Products labeled kosher-style are non-kosher products that have characteristics of kosher foods, such as all-beef hot dogs,[88] or are flavored or prepared in a manner consistent with Ashkenazi practices, like dill pickles.[89] The designation usually refers to delicatessen items.

Food producers often look to expand their markets or marketing potential, and offering kosher food has become a way to do that. The uniqueness of kosher food was advertised as early as 1849.[90] In 1911 Procter & Gamble became the first company to advertise one of their products, Crisco, as kosher.[91] Over the next two decades, companies such as Lender’s Bagels, Maxwell House, Manischewitz, and Empire evolved and gave the kosher market more shelf-space. In the 1960s, Hebrew Nationalhotdogs launched a “we answer to a higher authority” campaign to appeal to Jews and non-Jews alike. From that point on, “kosher” became a symbol for both quality and value. The kosher market quickly expanded, and with it more opportunities for kosher products. Menachem Lubinsky, founder of the Kosherfest trade fair, estimates as many as 14 million kosher consumers and $40 billion in sales of kosher products in the USA.[92]

In 2014 the Israeli Defense Forces decided to allow female kosher supervisors to work in its kitchens on military bases, and the first women kosher inspectors were certified in Israel.[93][94]

Advertising standards laws in many[quantify] jurisdictions prohibit the use of the phrase kosher in a product’s labelling unless the producer can show that the product conforms to Jewish dietary laws; however, different jurisdictions often define the legal qualifications for conforming to Jewish dietary laws differently. For example, in some places the law may require that a rabbi certify the kashrut nature, in others the rules of kosher are fully defined in law, and in others still it is sufficient that the manufacturer only believes that the product complies with Jewish dietary regulations. In several cases, laws restricting the use of the term kosher have later been determined to be illegal religious interference.[95]

In the United States the cost of certification for mass-produced items is typically minuscule,[96][97] and is usually more than offset by the advantages of being certified.[97]In 1975 The New York Times estimated the cost per item for obtaining kosher certification at 6.5 millionths of a cent ($0.000000065) per item for a General Foods frozen-food item.[98] According to a 2005 report by Burns & McDonnell, most US national certifying agencies are non-profit, only charging for supervision and on-site work, for which the on-site supervisor “typically makes less per visit than an auto mechanic does per hour”. However, re-engineering an existing manufacturing process can be costly.[99] Certification usually leads to increased revenues by opening up additional markets to Jews who keep kosher, Muslims who keep halal, Seventh-day Adventistswho keep the main laws of Kosher Diet, vegetarians, and the lactose-intolerant who wish to avoid dairy products (products that are reliably certified as pareve meet this criterion).[98][100][101][102] According to the Orthodox Union, one of the largest kashrut organizations in the United States, “when positioned next to a competing non-kosher brand, a kosher product will do better by 20%”.[103]

In some European communities there is a special tax imposed[by whom?] on the purchase of kosher meat to help support the community’s educational institutions.[dubious ][104] In 2009 delegates at a meeting of the Rabbinical Council of Europe broadly agreed that the tax which supports the rabbinate, mikvo’os and other communal facilities should be reduced. “While the supermarket Tesco sells a whole chicken for £2, its kosher counterpart of similar weight costs five to six times more.”[105]

A 2013 survey found that 22% of American Jews surveyed claimed to keep kosher in the home.[106] Many Jews observe kashrut partially, by abstaining from pork or shellfish, or by not drinking milk with a meat dish. Some keep kosher at home but will eat in a non-kosher restaurant. In 2012, one analysis of the specialty food market in North America estimated that only 15% of kosher consumers were Jewish.[107] Muslims, Hindus, and people with allergies to dairy foods often consider the kosher-parevedesignation as an assurance that a food contains no animal-derived ingredients, including milk and all of its derivatives.[108] However, since kosher-pareve foods may contain honey, eggs, or fish, strict vegetarians cannot rely on the certification.[109][110]

In Ancient Hebrew Kosher (Hebrew: כשר‎) means be advantageous, proper, suitable, or succeed[111] according to the Brown-Driver-Briggs Hebrew and English Lexicon. In Modern Hebrew, it generally refers to kashrut but it can also sometimes mean “proper”. For example, the Babylonian Talmud uses kosher in the sense of virtuous, when referring to Darius I as a “kosher king”; Darius, a Persian King, assisted in building the Second Temple.[112] In English, kosher often means legitimate, acceptable, permissible, genuine, or authentic.[113][114][114][115]

The word kosher is also part of some common product names. Sometimes it is used as an abbreviation of koshering, meaning the process for making something kosher; for example, kosher salt is a form of salt with irregularly shaped crystals, making it particularly suitable for preparing meat according to the rules of kashrut, because the increased surface area of the crystals absorbs blood more effectively.[116] At other times it is used as a synonym for Jewish tradition; for example, a kosher dill pickle is simply a pickle made in the traditional manner of Jewish New York City pickle makers, using a generous addition of garlic to the brine,[117] and is not necessarily compliant with the traditional Jewish food laws.[115]

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  18. ^ Leviticus 11–15
  19. ^ The Oxford Bible Commentary, eds. J. Barton and J. Muddiman. Oxford: Oxford University Press. 2001: 99.
  20. ^ Jump up to: a b c d Forst, Binyomin (1994). The laws of kashrus: a comprehensive exposition of their underlying concepts and applications. Brooklyn, N.Y: Mesorah Publications. pp. 32–49. ISBN 0-89906-103-6.
  21. ^ Leviticus 11:3–8
  22. ^ Deuteronomy 14:3–21
  23. ^ Babylonian Talmud, Hullin 13a (on Mishnah Hullin 1:1).
  24. ^ Genesis 9:4
  25. ^ Doron-spalter, Pinchos (2008). Major Concepts of the Talmud: An Encyclopedic Resource Guide, Volume 1. Targum Press. p. 7. ISBN 978-1-56871-465-3. Retrieved March 15, 2013.
  26. ^ Leviticus 19:23
  27. ^ Blech, Zushe Yosef (January 27, 2009). Kosher Food Production. Wiley-Blackwell. ISBN 978-0-8138-2093-4.
  28. ^ Leviticus 23:14
  29. ^ Exodus 23:19
  30. ^ Exodus 34:26
  31. ^ Deuteronomy 14:21
  32. ^ Exodus 23:19
  33. ^ Exodus 34:26
  34. ^ Deuteronomy 14:21
  35. ^ Leviticus 11:3–8
  36. ^ Shulchan Aruch, Yoreh De’ah 79
  37. ^ For a comprehensive review of the issue involving the difficulty that neither the hyrax nor the hare are ruminants, see Slifkin, Rabbi Nosson (2004). The Camel, the Hare & the Hyrax: A Study of the Laws of Animals with One Kosher Sign in Light of Modern Zoology (illustrated ed.). Zoo Torah in association with Targum/Feldheim. ISBN 978-1-56871-312-0..
  38. ^ Butcher, Tim (June 6, 2008). “Giraffe is kosher, rabbis rule in Israel”. The Daily Telegraph. Retrieved April 10, 2013.
  39. ^ Shulchan Aruch, Yoreh De’ah 82:1–5
  40. ^ Zivotofsky, Ari Z. “What’s the Truth About Giraffe Meat!”. Archived from the original on April 7, 2014. Retrieved May 22, 2013.
  41. ^ Deuteronomy 14:12–18
  42. ^ Bavli Chullin 3:22–23
  43. ^ Zivotofsky, Ari Z. “Is Turkey Kosher?, part 2”. Retrieved May 22,2013.
  44. ^ Zivotofsky, Ari Z. “Is Turkey Kosher?, part 3”. Retrieved May 22,2013.
  45. ^ Leviticus 11:9–12
  46. ^ Shulchan Aruch, Yoreh De’ah 83 and 84
  47. ^ Shulchan Aruch, Yoreh De’ah 85
  48. ^ Leviticus 11:13–31
  49. ^ Exodus 22:30-31
  50. ^ “What Does Kosher Mean? – section 2.4”.
  51. ^ Shulchan Aruch, Yoreh De’ah 87 et seq
  52. ^ “Kashrut: Jewish Dietary Laws”. Jewish Virtual Library. Retrieved May 22,2013.
  53. ^ Deuteronomy 12:21
  54. ^ Shulchan Aruch, Yoreh De’ah 1–65
  55. ^ Leviticus 17:10
  56. ^ Shulchan Aruch, Yoreh De’ah 66–78
  57. ^ “ABCs of Kosher”. Aish HaTorah. Retrieved March 15, 2013.
  58. ^ “Locusts Go Biblical – But Are They Kosher?”. The Jewish Daily Forward. Retrieved March 15, 2013.
  59. ^ Shulhan Arukh, Yoreh De’ah § 69:6; ibid., § 69:16–19
  60. ^ Shulhan Arukh, Yoreh De’ah, § 69:5
  61. ^ Rabbi Isaac Alfasi on Tractate Ḥullin (ed. Yosef Qafih), chapter Kol haBasar, Jerusalem 1960, p. 98.
  62. ^ Maimonides, Mishne Torah (Hil. Ma’achaloth Asuroth 6:10); cf. Babylonian Talmud, Hullin 111a.
  63. ^ Shulchan Aruch, Orach Chayim, 318:1
  64. ^ Exodus 12:15
  65. ^ Shulchan Aruch, Orach Chayim, 431–452
  66. ^ Brenner, Bayla Sheva. “Keeping Up with Passover Trenditions”. Orthodox Union. Retrieved May 22, 2013.
  67. ^ Davidson, Baruch S. “Which vegetables may be eaten on Passover?”. Retrieved May 22, 2013.
  68. ^ Heinemann, Moshe. “Terumos and Ma’asros”. Star-K. Retrieved April 10, 2013.
  69. ^ Posner, Menachem. “What is “Yashan”?”. Retrieved March 15,2013.
  70. ^ Posner, Eliezer. “Are vegan restaurants automatically kosher?”. Retrieved March 15, 2013.
  71. ^ “Why Check for Insects?”. Star-K. Archived from the original on March 21, 2013. Retrieved March 15, 2013.
  72. ^ The rennet must be kosher, either microbial or from special productions of animal rennet using kosher calf Archived 2012-03-06 at the Wayback Machine., Retrieved August 10, 2005.
  73. ^ “Meat, Dairy and Pareve”. OK Kosher Certification. Retrieved March 15, 2013.
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  76. ^ Shulchan Aruch, Yoreh De’ah 114
  77. ^ Shulchan Aruch, Yoreh De’ah 113
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  79. ^ Many rely on lenient rulings by Rabbi Moshe Feinstein in Teshuvot Igrot Moshe, Yoreh De’ah 1:47 and other 20th century rabbinic authorities who rule that strict government supervision prevents the admixture of non-kosher milk, making supervision unnecessary. See Rabbi Chaim Jachter. “Chalav Yisrael – Part I: Rav Soloveitchik’s View”. Retrieved December 2, 2007.
  80. ^ Shulchan Aruch, Yoreh De’ah 112, Orach Chayim 603
  81. ^ “What foods are kosher?”. Oxford Chabad Society. Retrieved March 15, 2013.
  82. ^ Rosenthal, Elizabeth (May 26, 2011). “Tests Reveal Mislabeling of Fish”. The New York Times. Retrieved May 22, 2013.
  83. ^ “How to choose a kosher certification”. Retrieved March 15,2013.
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  87. ^ “Kosher Supervision”. OK Kosher Certification. Retrieved March 15, 2013.
  88. ^ Zeldes, Leah A. (July 8, 2010). “Know your wiener!”. Dining Chicago. Chicago’s Restaurant & Entertainment Guide, Inc. Retrieved July 31, 2010.
  89. ^ Zeldes, Leah A. (July 20, 2010). “Origins of neon relish and other Chicago hot dog conundrums”. Dining Chicago. Chicago’s Restaurant & Entertainment Guide, Inc. Retrieved July 31, 2010.
  90. ^ “Early mention of kosher”. Public Ledger. 1849-03-15. p. 2. Retrieved 2017-05-12 – via open access publication – free to read.
  91. ^ Heinze, Andrew R. (1 August 1992). Adapting to Abundance: Jewish Immigrants, Mass Consumption, and the Search for American Identity. Columbia University Press. p. 176. ISBN 978-0-231-06853-6. Retrieved March 15, 2013.
  92. ^ “The History of Kosher”. Kosherfest. Archived from the original on March 21, 2013. Retrieved March 15, 2013.
  93. ^ “IDF To Allow Female Kosher Supervisors To Work on Military Bases”. The Jewish Daily Forward. 9 January 2014.
  94. ^ “First women kashrut inspectors certified in Israel – San Diego Jewish World”. San Diego Jewish World.
  95. ^ Popovsky, Mark. “The Constitutional Complexity of Kosher Food Laws” (PDF). Columbia University. Archived from the original (PDF) on September 22, 2013. Retrieved March 15, 2013.
  96. ^ Mikkelson, Barbara (May 24, 2002). “The Kosher Nostra”. Urban Legends Reference Pages. Retrieved 2006-10-23.
  97. ^ Jump up to: a b Brunvand, Jan Harold (November 2002) [2001]. “The Jewish Secret Tax”. Encyclopedia of urban legends (Reprint ed.). New York, NY: W. W. Norton & Company. pp. 222–223. ISBN 0-393-32358-7. LCCN 2001000883.
  98. ^ Jump up to: a b “The “Kosher Tax” Hoax: Anti-Semitic Recipe for Hate”. Anti-Defamation League. January 1991. Archived from the original on 2006-10-23. Retrieved 2006-10-23.
  99. ^ Morris, Lisa; Hays, Jim; York, Elaine (2005). “Obtaining Kosher Certification: The Engineering Implications for Food Processing” (PDF). TECHBriefs. Burns & McDonnell. 2005 (3): 1–3. Retrieved October 13, 2014.
  100. ^ Luban, Yaakov. “The “Kosher Tax” Fraud”. Orthodox Union. Retrieved 2006-10-23.
  101. ^ “Dispelling a rumor – there is no kosher tax or Jewish tax”. Boycott Watch. December 22, 2003. Retrieved 2006-10-24.
  102. ^ Levenson, Barry M. (2001). Habeas Codfish: Reflections on Food and the Law. University of Wisconsin Press. p. 188. ISBN 0-299-17510-3. Adherents to other faiths, including Moslems and Seventh-Day Adventists, look to kosher certification for a variety of reasons (including making sure the product is pork free).
  103. ^ “Why Go Kosher”. Orthodox Union. 2014. Retrieved October 13, 2014.
  104. ^ Wagner, Matthew (November 5, 2009). “High costs discourage europeans from keeping kosher”. Jewish Weekly.
  105. ^ Gold, Asher (October 29, 2009). “Brussels call for lower kosher tax” (PDF). Rabbinical Center of Europe.
  106. ^ “A Portrait of Jewish Americans: Chapter 4: Religious Beliefs and Practices”. Pew Forum. 1 October 2013. Retrieved 8 January 2015.
  107. ^ “The Specialty Food Market in North America”. Market Information. Agri-Food Trade Service, Canada. March 2012.
  108. ^ “Who Eats Kosher? Do You Have to Be Jewish to Eat Kosher?”. Kosher Directory. Retrieved March 14, 2013.
  109. ^ “Most Frequently Asked Questions”. The Vegetarian Resource Group. Retrieved October 17, 2013.
  110. ^ “What about kosher symbols?”. PETA. Retrieved October 17, 2013.
  111. ^ “A Hebrew and English lexicon of the Old Testament” (PDF). Palmer Theological Seminary.
  112. ^ Tractate Rosh Hashanah 3b, Schottenstein Edition, Mesorah Publications Ltd.
  113. ^ Eric Partridge; Tom Dalzell; Terry Victor (2006). The New Partridge Dictionary of Slang and Unconventional English: Volume 2, J-Z. Taylor & Francis. p. 388. ISBN 0-415-25938-X.
  114. ^ Jump up to: a b B.A. Phythian (1976). A concise dictionary of English slang and colloquialisms. The Writer, Inc. p. 110. ISBN 0-87116-099-4. Kosher Genuine. Fair. Acceptable.
  115. ^ Jump up to: a b Rich, Tracy. “Kashrut: Jewish Dietary Laws”. Retrieved March 14, 2013.
  116. ^ “Kosher Salt”. Archived from the original on 2015-12-30.
  117. ^ Bowen, Dana; Ralph, Nancy. “FROM PICKLE DAY EXHIBITS: What is a Pickle?”. New York Food Museum. Retrieved March 14, 2013.

  • Samuel H. Dresner; Seymour Siegel; David M. Pollock (1982). The Jewish Dietary Laws. United Synagogue Book Service. ISBN 978-0-8381-2105-4.
  • Isidor Grunfeld (1982). The Jewish Dietary Laws: Dietary laws regarding plants and vegetables, with particular reference to the produce of the Holy Land. ISBN 0-900689-22-6.
  • Isaac Klein, A Guide to Jewish Religious Practice, JTSA, 1992
  • David C. Kraemer, Jewish Eating and Identity Throughout the Ages, Routledge, 2008
  • James M. Lebeau, The Jewish Dietary Laws: Sanctify Life, United Synagogue of Conservative Judaism, New York, 1983
  • Yacov Lipschutz, Kashruth: A Comprehensive Background and Reference Guide to the Principles of Kashruth. New York: Mesorah Publications Ltd, 1989
  • Jordan D. Rosenblum, The Jewish Dietary Laws in the Ancient World. Cambridge University Press, 2016.
  • Jordan D. Rosenblum (2010-05-17). Food and Identity in Early Rabbinic Judaism. ISBN 978-0-521-19598-0.


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