What is Treif?
Also spelled / known as: Treyf, Tarfus, Non-kosher
In brief
Treif (literally 'torn') refers to any food that is not kosher — including forbidden animals (pork, shellfish), improperly slaughtered meat, mixtures of meat and dairy, and foods without kosher supervision.
Treif explained
Treif (also spelled treyf) is Yiddish for non-kosher food, derived from the Hebrew word 'treifa' meaning 'torn' — referring to animals whose flesh was torn by a predator, rendering them forbidden. Over time, the term expanded colloquially to mean any food that fails to meet kosher standards. This includes forbidden species (pork, shellfish, rabbit, birds of prey), meat from improperly slaughtered animals, meat and dairy mixtures, and foods prepared in non-kosher kitchens.
Real-world examples
Pork, shellfish (shrimp, lobster, crab), and cheeseburgers are treif
A regular (non-kosher) restaurant's menu is entirely treif
Meat and dairy mixed together (like a cheeseburger) is treif even if individual ingredients were kosher
Even kosher-ingredient food prepared in a treif kitchen becomes treif
Context & nuance
The distinction between kosher and treif is foundational to Jewish dietary practice. For observant Jews, consuming treif food is one of the most visible markers of non-observance. Technically, 'treif' originally referred to a narrower category — animals with certain internal defects — but in modern usage it covers anything non-kosher. The opposite of treif is simply 'kosher' (fit) or 'glatt kosher' for stricter standards.
Frequently asked questions
- What does treif mean?
- Treif (Yiddish from the Hebrew 'treifa') literally means 'torn,' originally referring to animals torn by predators. In modern usage, it means any food that is not kosher — including forbidden species, improperly slaughtered meat, mixed meat-and-dairy, and foods from non-kosher kitchens.
- Is shrimp treif?
- Yes — shrimp and all shellfish (lobster, crab, clams, oysters, scallops) are treif. The Torah permits only fish with both fins and scales, which excludes all shellfish. Catfish and swordfish are also non-kosher because they lack proper scales.
- Can a kosher food become treif?
- Yes. Kosher-ingredient food can become treif if prepared in a non-kosher kitchen, cooked in non-kosher utensils, or if meat and dairy accidentally mix. Contact with treif utensils at high temperatures can also render kosher food treif.
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Where Treif shows up
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Related terms
Kashrut
Kashrut is the body of Jewish dietary law derived from the Torah, defining which foods are permitted (kosher) and forbidden (treif), how animals must be slaughtered, and how meat and dairy must be kept separate.
Glatt Kosher
Glatt kosher (Yiddish for 'smooth') refers to meat from animals whose lungs were found to be free of adhesions upon inspection — a stricter standard than baseline kosher meat.
Shechita
Shechita is the Jewish method of ritual slaughter that renders an animal kosher — requiring a trained shochet to sever the trachea and esophagus with a single, swift cut using a perfectly smooth blade.
Hechsher
A hechsher is the symbol printed on a kosher product or displayed by a kosher establishment indicating which rabbinic agency has certified it as meeting kosher standards.
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