It is very hard to understand why. There is no real reason. We eat it because G-d told us to 2000 years ago. It is that simple.
Jews are only able to eat kosher food because it is against their religion to eat non kosher food.
Kosher food is not like a specific food. It is not like Hamburgers or anything. SOme foods are kosher and others aren't. Since most people eat all types of food, you can't really avoid eating kosher food.
The food has to be kosher.
Religiously observant Jews will only eat kosher food.
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 not eat any food that is not kosher. The basis of kashrut is the Torah, this is a part of the guidelines for living righteously given to the Jews by HaShem.
So Orthodox Jews can eat it.
There is no issue with Jews eating vegetarian food. However, religiously observant Jews would require that the food in question be kosher.
No. That applies mainly to Orthodox and Conservative Jews.
The Torah states that Jews should eat kosher food.
Religiously observant Jews will only eat foods that are kosher.