Why Do Jews Keep Kosher? Understanding the Jewish Dietary Laws

The Short Answer

Jews keep kosher because the Torah says to. That is, in the end, the most honest and direct answer you will find. The Hebrew Bible lays out a detailed set of dietary laws — what may be eaten, what may not, how animals must be slaughtered, which foods can be combined — and observant Jews follow these rules as an act of obedience to God’s commandments.

This may surprise people who expect a practical explanation. Surely there must be a reason — a health benefit, a food safety logic, an ancient wisdom about nutrition? People have been offering those theories for centuries. But the Jewish tradition itself is remarkably clear: these are chukkim — divine statutes whose reasons are not fully knowable. You follow them because God said so. And in that act of following, something profound happens.

The Torah Source

The laws of kashrut (from the Hebrew root meaning “fit” or “proper”) appear primarily in Leviticus 11 and Deuteronomy 14. These chapters lay out with surprising specificity which animals, birds, and fish may be eaten:

Land animals must have split hooves AND chew their cud. Cattle, sheep, goats, and deer qualify. Pigs, camels, and rabbits do not.

Fish must have fins AND scales. Salmon, tuna, and herring are in. Shrimp, lobster, crab, and catfish are out.

Birds are listed by forbidden species — mostly predators and scavengers. Chicken, turkey, duck, and goose are permitted.

Beyond the animal categories, the Torah adds a commandment repeated three times: “You shall not cook a kid in its mother’s milk” (Exodus 23:19, 34:26; Deuteronomy 14:21). From this single verse, the rabbis of the Talmud derived the entire system of separating meat and dairy — separate dishes, separate utensils, waiting periods between meals.

The Three Categories

All kosher food falls into one of three categories, and understanding them is the key to understanding a kosher kitchen:

Meat (fleishig): Flesh from kosher animals, slaughtered according to Jewish law (shechitah) by a trained slaughterer. The blood must be removed through salting and soaking, because the Torah forbids consuming blood.

Dairy (milchig): Milk and all milk products — cheese, butter, yogurt, cream. Must come from kosher animals and be processed with kosher equipment.

Pareve (neutral): Everything else — fish, eggs, fruits, vegetables, grains, nuts. These can be eaten with either meat or dairy, making them the peacemakers of the kosher kitchen.

The practical result: a traditional kosher kitchen has two complete sets of everything. Two sets of dishes, two sets of pots, two sponges, often two sinks. After eating meat, you wait — six hours in most traditions — before eating dairy. It sounds elaborate, and it is. That is rather the point.

Spiritual Discipline, Not a Health Code

Here is where well-meaning people often go wrong: kashrut is not a health code.

The idea that Jews avoid pork because it carried trichinosis, or that shellfish was dangerous in the ancient Near East, has been repeated so often it has become common wisdom. But it is not the Jewish reason for keeping kosher. Maimonides, the great medieval philosopher, did suggest health benefits — but even he acknowledged that the primary reason was divine command. And many later authorities pushed back even on Maimonides, arguing that searching for rational explanations misses the point entirely.

Rabbi Yeshayahu Leibowitz, the 20th-century Israeli thinker, put it directly: kashrut is about accepting the yoke of heaven. It is an act of discipline that interrupts the most basic, animal act of eating and injects it with consciousness. You do not eat whatever you want, whenever you want, however you want. You stop. You think. You choose. Three times a day, every day, you are reminded that you are a Jew living in relationship with God.

There is also a dimension of holiness — kedushah. The Torah says, “You shall be holy, for I the Lord your God am holy” (Leviticus 19:2). Kashrut is one of the ways Jews sanctify ordinary life. Eating is not just fuel. With the right intention and the right practices, a Tuesday lunch becomes a sacred act.

The Modern Spectrum

How strictly do Jews actually keep kosher? The answer stretches across a wide spectrum, and honest observers will tell you that the range is enormous.

Orthodox Jews generally maintain strict kashrut — separate dishes, kosher-only restaurants, careful label reading, waiting periods between meat and dairy. Many will eat only foods with reliable hechsher (kosher certification symbols).

Conservative Jews traditionally keep kosher at home but may be more flexible when eating out. The Conservative movement’s Committee on Jewish Law and Standards has issued various rulings on kashrut, sometimes permitting practices that Orthodox authorities would not.

Reform Jews generally view kashrut as a personal choice rather than a binding obligation. Some Reform Jews keep kosher as a meaningful spiritual practice; many do not. The movement emphasizes ethical eating — fair labor, sustainability, animal welfare — as a modern expression of kashrut’s underlying values.

Secular and cultural Jews may avoid pork or shellfish out of cultural habit or family tradition without maintaining the full system of kashrut. “I don’t keep kosher, but I don’t eat pork” is a sentence you will hear from many Jewish families.

Why It Matters

Kashrut is one of the 613 commandments that form the framework of Jewish law. But it is also something more: it is one of the most visible, daily, tangible expressions of Jewish identity. In a world that often asks Jews to blend in, keeping kosher is a three-times-daily declaration of difference. It shapes social life, limits restaurant choices, complicates travel, and creates community.

Ask someone who keeps kosher why they do it, and you will likely get answers that range from “because God said so” to “because my grandmother did” to “because it makes me think about what I’m putting in my body.” All of these answers are true. Kashrut operates on multiple levels — legal, spiritual, communal, personal — and it has done so for over three thousand years.

That staying power is worth noticing. In a culture of mindless consumption, a system that says stop and think before you eat may be more relevant than ever.