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Jain vegetarian diet is practiced by the followers of Jain culture and philosophy. It is considered to be one of the most rigorous form of spiritually-motivated diet on the Indian subcontinent and beyond. The Jain cuisine is completely vegetarian and it also excludes onions and garlic, similar to the shojin-ryori cuisine of Japan. The strictest forms of Jain diet is practiced by the monastic ascetics, it may additionally exclude potatoes and other root vegetables. This food is called in Sanskrit a 'sattvic' food, which means that it is based on the qualities of goodness, lightness and happiness. On the other hand, onions and garlic are regarded to be 'tamasic', as they tend to have a quality of darkness, lethargy and indeed a putrid smell.
Jain objections to the eating of meat, fish and eggs are based on the principle of nonviolence (ahimsa, literally "non-injuring"). Every act by which a person directly or indirectly supports killing or injury is seen as act of violence (himsa), which creates harmful reaction karma. The aim of ahimsa is to prevent the accumulation of such karma. The extent to which this intention is put into effect varies greatly among Hindus, Buddhists and Jains. Jains consider nonviolence to be the most essential religious duty for everyone (ahinsā paramo dharmaḥ, a statement often inscribed on Jain temples). It is an indispensable condition for liberation from the cycle of reincarnation, which is the ultimate goal of all Jain activities. Jains share this goal with Hindus and Buddhists, but their approach is particularly rigorous and comprehensive. Their scrupulous and thorough way of applying nonviolence to everyday activities, and especially to food, shapes their entire lives and is the most significant hallmark of Jain identity. A side effect of this strict discipline is the exercise of asceticism, which is strongly encouraged in Jainism for lay people as well as for monks and nuns.
- For Jains, lacto-vegetarianism (generally known simply as vegetarianism in India) is mandatory. Food which contains even small particles of the bodies of dead animals or eggs is absolutely unacceptable. Some Jain scholars and activists support veganism, as the production of dairy products is perceived to involve violence against cows.
- Jains go out of their way so as not to hurt even small insects and other tiny animals, because they believe that harm caused by carelessness is as reprehensible as harm caused by deliberate action. Hence they take great pains to make sure that no minuscule animals are injured by the preparation of their meals and in the process of eating and drinking.
- Traditionally Jains have been prohibited from drinking unfiltered water. In the past, when stepwells were used for the water source, the cloth used for filtering used to be reversed and some filtered water was poured over it to return the organisms to the original body of water. This practice of jivani or bilchavani is no longer possible because of the use of pipes for water supply. Modern Jains may also filter tap water in the traditional fashion and a few continue to follow the filtering process even with commercial mineral or bottled drinking water.
- Jains make considerable efforts not to injure plants in everyday life as far as possible. Jains only accept such violence inasmuch as it is indispensable for human survival, and there are special instructions for preventing unnecessary violence against plants. Strict Jains don’t eat root vegetables such as potatoes, onions, roots and tubers, because such root vegetables are considered to be 'ananthkay'. 'Ananthkay' means one body, but containing countless lives. A regular vegetable such as cabbage has number of leaves and lives as could be counted by a layman. However, a root vegetable such as potato, though from the looks of it is one article, is said to contain multiple lives ('ekindriya') in it. Also, tiny life forms are injured when the plant is pulled up and because the bulb is seen as a living being, as it is able to sprout. Also, consumption of most root vegetables involves uprooting and killing the entire plant. Whereas consumption of most terrestrial vegetables doesn't kill the plant (it lives on after plucking the vegetables or it was seasonally supposed to wither away anyway).
- Mushrooms, Fungus and Yeasts are forbidden because they are parasites, grow in non-hygienic environments and may harbour other life forms. Alfalfa is the only known plantae that contains vitamin D2 source they can use or make vitamin D2 supplements from.
- Honey is forbidden, as its collection would amount to violence against the bees.
- Food items that have started to decay are prohibited.
- Traditionally cooking or eating at night was discouraged because insects are attracted to the lamps or fire at night. Strict Jains take the anastamita or anthai vow of not eating after sunset.
- Strict Jains do not consume food which has been stored overnight, as it possesses a higher concentration of micro-organisms (for example, bacteria, yeast etc.) as compared to food prepared and consumed the same day. Hence, they do not consume yoghurt or dhokla & idli batter unless they've been freshly set on the same day.
- Jains do not consume fermented foods (beer, wine and other alcohols) to avoid killing of a large number of microorganisms associated with the fermenting process.
Influence on vegetarian cuisines in India 
The vegetarian cuisines of some regions of the Indian subcontinent have been strongly influenced by Jainism. These include
- Gujarati Jain cuisine
- Marwari Jain cuisine of Rajasthan
- Bundelkhandi Jain cuisine of central India
- Agrawal Jain cuisine of Delhi/UP
- Marathi Jain cuisine of South Maharashtra
- Jain Bunt cuisine of Karnataka
In India, vegetarian food is regarded to be appropriate for everyone for all occasions. This makes vegetarian restaurants quite popular. Many of vegetarian restaurants and Mishtanna sweet-shops - for example, the legendary Ghantewala sweets of Delhi and Jamna Mithya in Sagar - are run by Jains.
Some restaurants in India serve Jain versions of vegetarian dishes that leave out carrots, potatoes, onions and garlic. A few airlines also serve Jain vegetarian dishes upon prior request.
Strict Buddhist cuisine is similar to Jain cuisine in leaving out onions and garlic. The term satvika often implies Indian cuisine without onions and garlic; strict Jain cuisine also excludes other root vegetables like potatoes.
Historical background 
When Mahavira revived and reorganized the Jain movement in the 6th or 5th century BCE, ahimsa was already an established, strictly observed rule. Parshva, a Tirthankara whom modern Western historians consider an historical figure, lived in about the 8th century BCE and founded a community to which Mahavira’s parents belonged. Parshva’s followers vowed to observe ahimsa; this obligation was part of their "Fourfold Restraint" (caujjama dhamma). Mahavira adopted it into his code of conduct.
In the times of Mahavira and in the following centuries, Jains criticized Buddhists and followers of the Vedic religion or Hindus for negligence and inconsistency in the implementation of ahimsa. In particular, they strongly objected to the Vedic tradition of animal sacrifice with subsequent meat-eating and to the hunting.
Early Buddhism discouraged eating animals that were slaughtered for the purpose of eating. The Buddha declared:
... meat should not be eaten under three circumstances: when it is seen or heard or suspected (that a living being has been purposely slaughtered for the eater); these, Jivaka, are the three circumstances in which meat should not be eaten, Jivaka! I declare there are three circumstances in which meat can be eaten: when it is not seen or heard or suspected (that a living being has been purposely slaughtered for the eater); Jivaka, I say these are the three circumstances in which meat can be eaten.—Jivaka Sutta, MN 55
In the Tamil classic Tirukkuṛaḷ, Valluvar, who is regarded to be a Jain by some scholars, criticizes the Buddhists for accepting the same of meat:
256 If the world did not purchase and consume meat, no one would slaughter and offer meat for sale.
Some Brahmins - Kashmiri Pandits, Bengali Brahmins and Saraswat Brahmins - have traditionally eaten meat (primarily seafood). However in regions with strong Jain influence such as Rajasthan and Gujarat, or strong Jain influence in the past such as Tamil Nadu, Brahmins are strict vegetarians. Bal Gangadhar Tilak has described Jainism as the originator of Ahimsa. He wrote in a letter:
In ancient times, innumerable animals were butchered in sacrifices. Evidence in support of this is found in various poetic compositions such as the Meghaduta. But the credit for the disappearance of this terrible massacre from the Brahminical religion goes to Jainism.
Some Western authors have interpreted the texts in different way to show that ancient Jain ascetics accepted meat as alms if the animal had not been specifically killed for them. If this is correct then they applied the same standard as early Buddhists. Some passages in two of the earliest Svetambara Jain texts, the Acaranga Sutra and the Dasaveyaliya, have been interpreted as regulations for specific types of meat and bones which were considered to be acceptable alms. This can also be interpreted at references to fruits and seeds. Another Svetambara text, the Viyahapannatti, tells a story where Mahavira himself eats kutkutmansa, which may be interpreted as meat of a cock. Medieval Jain commentators of these passages interpreted them in the literal meaning, but also mentioned the opinion that the offensive words had different meanings, some of which did not refer to animals and hence was compatible with vegetarianism. Jains, who are strict vegetarians, do not accept the interpretations of Western scholars.
See also 
- "Jainism: The World of Conquerors - Natubhai Shah - Google Books". Books.google.com. Retrieved 2012-06-26.
- "Faith & Philosophy of Jainism - Arun Kumar Jain - Google Books". Books.google.com. Retrieved 2012-06-26.
- Laidlaw, James: Riches and Renunciation. Religion, economy, and society among the Jains, Oxford 1995, p. 26-30, 191-195.
- Dundas, Paul: The Jains, second edition, London 2002, p. 160; Wiley, Kristi L.: Ahimsa and Compassion in Jainism, in: Studies in Jaina History and Culture, ed. Peter Flügel, London 2006, p. 438; Laidlaw p. 153-154.
- Hemacandra, Yogashastra 2.31.
- Laidlaw p. 154-160; Jindal, K.B.: An epitome of Jainism, New Delhi 1988, p. 74-90; Tähtinen, Unto: Ahimsa. Non-Violence in Indian Tradition, London 1976, p. 110; Dundas p. 176-177.
- Dundas p. 187-192, 199-200; Laidlaw p. 153-159.
- Laidlaw p. 166-169; Tähtinen p. 37.
- Jindal p. 89; Laidlaw p. 54, 154-155, 180.
- Sutrakrtangasutram 1.8.3; Uttaradhyayanasutra 10; Tattvarthasutra 7.8; Dundas p. 161-162; Granoff p. 32-35.
- Sangave, Vilas Adinath: Jaina Community. A Social Survey, second edition, Bombay 1980, p. 260-261; Tähtinen p. 109.
- Lodha, R.M.: Conservation of Vegetation and Jain Philosophy, in: Medieval Jainism: Culture and Environment, New Delhi 1990, p. 137-141; Tähtinen p. 105; Dundas p. 106.
- Laidlaw p. 156-157, 167-170; Sangave p. 260.
- Hemacandra: Yogashastra 3.37; Laidlaw p. 166-167; Tähtinen p. 109.
- "Catering to Jain palate". The Hindu. 2004-06-30. Retrieved 2010-05-05.
- "A royal treat in Chandni Chowk". Hinduonnet.com. 2002-11-07. Retrieved 2010-05-05.
- "Air Travel Vegetarian Style". Happycow.net. Retrieved 2010-05-05.
- "Jain recipes". Tarladalal.com. Retrieved 2010-05-05.
- Traditional dates Mahavira's death to 527 BCE.
- Goyala, Śrīrāma (1987). A history of Indian Buddhism. Meerut: Meerut : Kusumanjali Prakashan. pp. 83–85.
- Chatterjee, Asim Kumar (2000). A comprehensive history of Jainism, vol.1, 2nd rev. ed. New Delhi: Munshiram Manoharlal Publishers. p. 14. ISBN 81-215-0931-9.
- Dundas p. 19, 30; Tähtinen p. 132.
- Dundas p. 30 suggests the 8th or 7th century; the traditional chronology places him in the late 9th or early 8th century, Chatterjee p. 15.
- Acaranga Sutra 2.15; Chatterjee p. 20-21.
- Sthananga Sutra 266; Tähtinen p. 132; Goyal p. 83-84, 103.
- Dundas p. 160, 234, 241; Wiley p. 448;
- Granoff, Phyllis (1992). "The Violence of Non-Violence: A Study of Some Jain Responses to Non-Jain Religious Practices". Journal of the International Association of Buddhist Studies 15: 1–43.
- Tähtinen p. 8-9.
- Tiruvaḷḷuvar; trans. Satguru Sivaya Subramuniyaswami (2000). Tirukkuṟaḷ = Tirukural : ethical masterpiece of the Tamil people. New Delhi: Abhinav Publications. ISBN 81-7017-390-6.
- Bombay Samachar, Mumbai:10 Dec, 1904
- Alsdorf, Ludwig: Beiträge zur Geschichte von Vegetarismus und Rinderverehrung in Indien, Wiesbaden 1962, p. 564-570; Dundas p. 177; Jain, Jagdishchandra: Life in Ancient India as Depicted in the Jain Canon and Commentaries, second edition, New Delhi 1984, p. 171
- Acaranga Sutra 126.96.36.199-6; Dasaveyaliya 5.1.73 and 5.1.84-86.
- Viyahapannatti, Shataka 15
- Shilanka in his commentary on the Acaranga Sutra (completed in 872 CE; non-vegetarian interpretation), Haribhadra in his commentary on the Dasaveyaliya (8th century CE; both interpretations), Abhayadeva in his commentary on the Viyahapannatti (11th century CE; both interpretations); the relevant passages are quoted by Alsdorf p. 566-568. See also Jain p. 171-172, Dundas p. 177.
- Alsdorf p. 564, 568-569.