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In page Food and drink prohibitions:

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The original reason for this taboo is debated. Maimonides seems to have thought the uncleanness of pigs was self-evident, but mentions with particular aversion their propensity to eat feces.[4] In the 19th century some people attributed the pig taboo in the Middle East to the danger of the parasite trichina, but this explanation is now out of favour.[4] James George Frazer suggested that in ancient Israel, Egypt and Syria, the pig was originally a sacred animal, which for that reason could not be eaten or touched; the taboo survived to a time when the pig was no longer regarded as sacred, and was therefore explained by reference to its being unclean.[5]