LEV163 Man shall observe the laws regarding he who has an impure flow from his body. Hashem distances us from overindulgence and commands us to be upright. We must sanctify ourselves by not partaking of worldly pleasures more than what is necessary and fitting for decent, upright people. Self-control is required regarding not only food in frank, but also any other physical pleasure. Without question, such emissions from the body result from habitual overindulgence of food and drink. The ingested substances accumulate in the person’s system until they become the disgusting issue that was emitted. Through distancing ourselves from this impurity, we teach ourselves moderation, so that whenever we partake of any of this world's pleasures, we will do so in an upright fashion.