The Jewish dietary laws and customs are complex, having developed over the course of many centuries and have been interpreted and applied differently in different communities around the world. However, the underlying foundation is the same everywhere, even if the manner in which different Jews observe the customs differs. I present here a broad overview and explanation.

Jewish dietary laws derive from several sources and have developed over time. The Bible contains a number of seemingly unrelated restrictions which form the basis of the laws of Kashrut:

The rabbis expanded the the dietary restrictions to safeguard against transgressing the prohibitions of the Torah. Their legislations includes:

Later discussion include the controversies about the status of various cheeses and wines and the status of glass dishes, which are used by some for both milk and meat dishes, because they are non-porous and therefore cannot absorb food particles. To encapsulate the argument concerning glass dishes: While it is possible to clean food off glass dishes completely, one loses the visual distinction between milk and meat utensils and the pedagogic value of having separate dishes.

Today, addition concerns have arisen that are of an ethical nature. The cruel environment in which veal is produced has given rise to the notion that on moral grounds, veal can be considered to be non-kosher. Judaism teaches the principle of tza'ar baalei chayim (concern for the suffering of animals) and the manner in which veal is raised is a clear violation of this principle. Similarly, table grapes grown in the United States have come under scrutiny and been declared unkosher by some groups on the basis of the danger their growing and harvesting present to the migrant farm-workers who pick them and are subjected to dangerous chemicals.

The opening chapters of the Torah make clear that God's intention for humanity was a vegetarian diet. Adam and Eve are permitted the fruits and vegetables of the Garden of Eden, but not animals. It is only after the Flood that God permits people to consume flesh and here it appears to be a compromise, at best. Hence, some Jews today are calling for a vegetarian diet as the purest form of Jewish diet.

Today, there is a wide spectrum of ways in which Jews observe the laws of kashrut. Some keep a strict vegetarian diet. Others observe what they term "biblical kashrut" which means that they observe the restrictions set out in the Torah, but not the enlargement of rabbinic legislation. This means that they avoid forbidden foods and the blood of animals. Others separate milk and meal to varying degrees; some keep separate dishes, pots, and utensils; others cook and store milk and meat separately, but keep only one set of dishes, pots, and utensils. Some people keep a kosher kitchen at home, and eat vegetarian food outside the house. Others maintain a kosher kitchen at home only. There is great variety in the way people observe the laws of kashrut in their lives.

I am frequently asked: What is the point of keeping kosher? Several decades ago it was popular to say that kashrut was a Jewish health regimen, but this is not the case. We know that proper handling and cooking of pork and shellfish render them harmless for consumption. Indeed, it would appear that health is not the issue at all. It is my opinion that there are two other principles operating behind the scenes here: (1) Kashrut requires obedience to a set of practices and standards that are NOT rational; they simply are. That means that one keeps kosher because it is a Jewish obligation. No more, no less. It is a purely religious act and, as such, has great spiritual value. What is more, it is an identifying feature in one's life. (2) When we consider what aspects of being human are most like other animals, eating and procreating float to the top of the list. Judaism bids us elevate these animal functions from the level of the mundane to the level of the kedushah (holiness). In both cases, there is a Jewish way to approach these baser functions in order to elevate them to holy acts. In the case of eating, carefully considering the source of what we eat -- and in the case of meat, that a life was sacrificed for our nutrition and eating pleasure -- as well as the means of preparation, is of great value. If something so mundane as eating can become an act of kedushah, then surely all our lives can be elevated to this level if we but give our words and deeds the attention they deserve.

More Rituals and Practices: