Kosher food is food that conforms to the Jewish dietary law, or kashrut. Some of the foods in a kosher diet can be found in the books of Leviticus 11:1-47 and Deuteronomy 14: 3-20, as can some of the kosher rules. One of the first commandments given to human beings was about food; Adam and Eve were commanded not to eat fruit from the Tree of Life. Some Rabbi’s believe that to follow a kosher diet instills discipline from an early age, while others believe the eating kosher food is good for a person’s soul, just as eating food in general is good for the body.
The Torah commands that only meat from particular animals is to be consumed by humans, and that meat must be killed and prepared in a certain way. Once an animal’s has been killed, Jewish persons are not allowed to consume the blood, the fat called helev, or the sciatic nerve of the animal. The Torah explains that the reason one must not consume the blood is because it is the life source and soul of the animal.
The Torah is also very strict when it comes to the mixing of milk and meat, which must never be done. There will even be separate dishes, cutlery, and even separate sinks used when preparing food that has either milk or meat in them. If you eat a food that does not contain either meat or milk such as a salad, you may consume milk or meat with the salad, but not both.
Some modern day followers of the Jewish faith believe that kosher dietary rules are simply ancient health regulations which are now considered obsolete because of modern methods of preparing food. While studying the why of eating kosher, secular scholars are proposing that the restrictions have more to do with the environment. Take for example the camel, which is not kosher was more useful as a working animal than a source of food.
The short answer as to why those of the Jewish faith eat only kosher foods is; because the Torah says to. The Torah does not explain the dietary restrictions but to those of the Jewish faith it does not require further explanation; the Torah says to do it, so they do. Obedience to God is shown by following all of His laws, regardless of whether or not you understand why.