Food, and if they are observant Jews, kosher food. There are two fast days in the Jewish calendar when Jews do not eat anything. Perhaps these are the "non regular days" to which the question refers. These are Yom Kippur and Tisha B'Av.
Regardless of the day of the week, Jews eat only Kosher foods.
simle regular food, exept for relegious jaws who eat "Kosher" food.
Jews eat food -- observant Jews attempt to keep the laws of kashrut by eating kosher food. When? Many Jews eat 3 meals a day with occasional snacks. Some skip breakfast.
Don't no
Nothing. Just regular kosher English foods.
no they eat food native to their area
That depends on what country they're from and where they live. Religiously observant Jews will only eat kosher food.
They eat about 2kg of food per day...
Jews who eat kosher will not eat snails since snails are not kosher. However, not all Jews eat according to the laws of kashrut, so some Jews do eat snails.
yes, that kind of thing, or that they would steal from them, or spread disease.
Observant Jews do not eat crayfish.
Orthodox Jews are only allowed to eat kosher foods.