By the fact that Jews keep kosher.
In order to be kosher, food has to be prepared according to the kosher-laws (see Deuteronomy ch.14). These are explained in detail in the Talmud-volume of Chullin.
* Meat must be from those land animals which have split hooves and chew their cud (such as beef, venison and mutton).
* Fish have to have scales and fins. Shellfish are not kosher.
* Birds cannot be among those listed as forbidden in the Torah (Deuteronomy ch.14) and cannot be hunters/scavengers. In actual practice, today we eat only those species concerning which we have a tradition that they're permitted, such as domestic chicken, geese, pigeons and turkey.
* Animals must be slaughtered in the manner specified by Jewish law and must be free of all disease. In actual practice, those who keep kosher purchase meat which is certified as having been prepared in the kosher manner.
* As much blood as possible must be removed from meat before cooking, since consumption of blood is forbidden (Leviticus ch.17). This is done at home or by the kosher butcher, through salting, soaking and rinsing.
* Dairy and meat cannot be combined in the same meal and there's a waiting period between eating one and then the other. After dairy: 1/2 hour. After meat: 6 hours for most Jewish communities.
* Fruits and vegetables should be checked to be sure they're free of bugs. Some Jews avoid cauliflower, asparagus, and the like, because of the difficulty in checking them.
Additionally, food must be prepared and handled following kashrut-laws and with kosher ingredients only. Any food that does not meet these requirements cannot be eaten by those who are religiously observant. Foods which are purchased should be labeled as having had kosher supervision during their processing.
See also:
Food prepared according to the laws of kashrut (Jewish dietary laws) is referred to as 'kosher'.
The Jewish food laws started 3300 years ago, when the Torah was given. They are still ongoing today because the Torah is for all generations. See also:The Jewish food-laws
Yes, religiously observant Jewish kids follow the laws of kashrut.
It is food prepared in accordance with Jewish Laws
kosher food.
Religious influence? If a food is kosher, it is produced in compliance with the laws found within the Torah, the Jewish holy book.
The core rules that Jewish dietary laws are based on are found in the Torah. The actual dietary laws, called 'kashrut', are found in the Talmud.
Kosher food isprepared in accordance with Jewish Dietary Laws, which are rules and regulations concerning food that are derived from Biblical laws and rabbinical interpretations.
The laws of kashrut.See also the Related Link.Kashrut-laws
The Jewish dietary laws are called 'kashrut'. Food that is prepared according to the laws of kashrut is 'kosher'. The word kosher literally means fit, as in, fit for consumption. Fleishig is the term used to describe food that contains meat.
Kosher food isprepared in accordance with Jewish Dietary Laws, which are rules and regulations concerning food that are derived from Biblical laws and rabbinical interpretations.
Kosher.