LEV79 Do not eat “cheilev.” “Cheilev”--certain fats of kosher animals--may not be eaten. A person's body is meant to serve his soul. The human soul is able to act only with the help of the body that clothes it. To the extent that the body is healthy and functions properly, the person will be able to understand the wisdom within him and will be drawn after it. Therefore, one needs to try to keep one's body healthy and strong. It is known that good health requires good and nutritious foods, and bad food is harmful to health. Out of His great kindness, Hashem in His Torah distances us from every food that is harmful to our bodies. Cheilev is forbidden because it gives rise to noxious liquids in the body. Any food forbidden by the Torah is in some way harmful to us, whether we are aware of the hazard or not. Such is the simple reason for the Torah’s forbidding us anything that might be used as food.