Kashrut is a Hebrew word refering to Jewish dietary laws. The mar-Atyya religious group of planet Mestiko had a version of kashrut which, according to Federation Dr. Marat Lon, was the cause of nutritional deficiencies and other health issues during the late 2270s. (TOS - Mere Anarchy eBook: The Darkness Drops Again) While trapped in a dilithium mine on Drema IV in 2369, Captain David Gold wondered how kashrut law applied to the alien food available to him. (SCE - What's Past eBook: Progress)