The Torah in Parashat Sav (Vayikra 7:23) forbids partaking of the Heleb – certain fats – of oxen, sheep and goats. The Sefer Ha’hinuch explains that the Torah forbade consuming these fats because, quite simply, they are unhealthful, and can cause physical harm. A person’s health, the Sefer Ha’hinuch writes, depends largely on the food he eats, because the body is always decomposing, and food is needed to replenish the body. In essence, then, the food one eats becomes his body, and therefore, ingesting good food causes the body to be strong and healthy, whereas ingesting bad food is harmful to the body. G-d, in His infinite kindness, commanded us to refrain from foods which cause us harm, and He thus forbade the consumption of Heleb, which is unhealthful. As mentioned, the Torah specifies the Heleb of oxen, sheep and goats, and thus the Heleb of other animals is permissible. This prohibition applies even to the Heleb of a Nebela – animal which died in a manner other than proper Shehita (slaughtering) – and of a Terefa – animal which suffers from a fatal physical condition. The meat of these animals, of course, is forbidden because of the prohibition against eating meat of a Nebela or Terefa, and the Heleb is also forbidden just like the Heleb of properly slaughtered, permissible animals. If a pregnant animal is slaughtered, then the Heleb of the fetus is permissible for consumption. Since the fetus is considered part of the mother’s body, and the mother underwent proper Shehita, the fetus’ Heleb may be eaten. However, the Rambam maintains that this does not apply if the pregnancy had reached full-term, such that the fetus was fully developed and ready for birth when the slaughtering occurred. In such a case, according to the Rambam, the fetus is regarded as a separate animal, such that its Heleb is forbidden. Most other authorities dispute this ruling of the Rambam. The prohibition of Heleb features a unique leniency, as it is permissible to sell it commercially. Whereas it is generally forbidden to do commerce with forbidden foods, one may engage in commerce selling Heleb. This leniency results in an interesting distinction between Behemot (domesticated animals) and Hayot (non-domesticated animals). The fats of non-domesticated animals are not only permissible, but not even considered “Heleb” at all. Therefore, if such an animal is a Nebela or Terefa, its fat may not be sold commercially, since it does not qualify as “Heleb” and is therefore not subject to this special leniency. This fat is treated like the other portions of the Nebela or Terefa, which are forbidden for consumption and also for commercial use. It is only the fat of domesticated animals, which has the formal status of “Heleb,” which may be sold commercially. The Heleb prohibition applies in all places, in all times, and to both men and women. One who intentionally eats a Ke’zayit of Heleb is liable to Malkut and Karet. If one accidentally eats a Ke’zayit of Heleb, he must bring a Hatat (sin-offering).