Judaism — Insects and Kashrut

What it is

The Jewish dietary laws (kashrut) have specific and detailed provisions regarding insect consumption that are unique among major world religions in their degree of specificity. The Torah's dietary laws create both restrictions on insect consumption and specific exceptions that permit certain insects under defined conditions.

Religious & theological context

The book of Leviticus (11:20–23) establishes the foundational prohibition on most insect consumption: "All flying insects that walk on all fours are to be regarded as unclean by you. There are, however, some flying insects that walk on all fours that you may eat: those that have jointed legs for hopping on the ground. Of these you may eat any kind of locust, katydid, cricket or grasshopper. But all other flying insects that have four legs you are to regard as unclean." The "four legs" description is the biblical categorization of insects as a class; the prohibition is on insects as a category with the specific exception carved out for certain jumping insects.

The Levitical exception for locusts, katydids, crickets, and grasshoppers — jumping insects with jointed legs — is thus the single category of insect that is potentially kosher. However, the practical application of this exception is complicated by questions of species identification (which specific species are the biblical arbeh, sol'am, chargol, and chagav listed in Leviticus?) and by the differing traditions of Ashkenazic and Sephardic Jewish communities.

Among Ashkenazic (Central and Eastern European) Jewish communities, the tradition developed of treating all locusts and grasshoppers as practically non-kosher due to the difficulty of reliably identifying the permitted species — the chain of oral tradition needed to identify the correct species had been broken, in the Ashkenazic view. This is known as "practical prohibition by loss of tradition." As a result, Ashkenazic kosher observance treats grasshopper and locust consumption as non-permissible in practice.

Among Yemenite Jewish communities specifically, an unbroken tradition of locust consumption exists, with a specific chain of identification (masorah) connecting contemporary Yemenite Jews to the Levitical permission. Yemenite Jews consume Schistocerca gregaria (the desert locust) as a traditional food, and this practice is considered halachically valid because the chain of species identification has been preserved. Contemporary Israeli food and halachic discussions have revisited the locust question in the context of locust swarms affecting Israel.

The broader prohibition on insects is operationally significant in contemporary kosher practice not primarily because people are seeking to eat insects but because insects are an incidental contaminant of vegetable produce. Leafy vegetables, in which small insects may hide, require specific inspection and washing procedures under strict kashrut observance, because even microscopic insects render produce non-kosher if consumed. This has driven the development of specialized lighting systems, inspection procedures, and in some communities, preference for insecticide-treated produce over organic produce, as organic vegetables are more likely to harbor insects.

Reference notes

Cross-link to: Kashrut (dietary laws); Locust; Kosher certification; Leviticus dietary laws; Yemenite Jewish cuisine.

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