Because it is a requirement of living life as a Jew as set out in the Torah.
Jews eat kosher food because that is one of the paths to living righteously according to the Torah.
Jews are only able to eat kosher food because it is against their religion to eat non kosher food.
The food has to be kosher.
Religious Jews eat only kosher foods. Gluten is an ingredient in food.
Jews who eat non-kosher food are in violation of the laws of their religion.
Religiously observant Jews will only eat kosher food.
The Torah states that Jews should eat kosher food.
Religiously observant Jews will only eat foods that are kosher.
So Orthodox Jews can eat it.
Regardless of the day of the week, Jews eat only Kosher foods.
simle regular food, exept for relegious jaws who eat "Kosher" food.
The Muslims have their own way of slaughtering animals for food. Where that is not available, they may eat kosher food. They may eat Halal food cooked by the Jews and the Christians.
Religiously observant Jews will only eat food that is kosher.