a) When a person feels some hunger, that the desire to eat overcomes him, he should know that he has enemies, as the Sages said, "Because a person is made poor (feels a lack) down below (in this world), he is made poor in the world above" (Sanhedrin,103). Therefore, he has to destroy and break the animal within him which desires to eat, for the essence of hunger is the animalistic element in a person. By this, he will be saved from his enemies.
b) Hunger also reflects controversy, "the reproach of famine"(Ezekiel,36,30), that's to say, the craving for food brings controversy, that they reproach and disgrace him, and also the opposite. This hunger is an aspect of uncircumcised skin, as it says, "It is a disgrace for us" (Gen. 34). For there are three husks that surround the brit of peace. But, when you break this disgrace, the craving for food, the covenant of peace becomes revealed and one merits to peace in the world below. Then, there is also peace in the world above in the Heavens. As a result, the bounty increases and becomes revealed in the world. (This is what the verse says, "He makes peace in your borders and fills you with the finest wheat."(Psalms,147,14). )
c) When you have relations with your wife with holiness and you break the animal soul which craves for the physical, imagining that an angel forces you to engage in relations, by this your children will not die when young. The death of young children, Heaven forbid, is because of the animal soul.
d) Also, you should see to it that the main time for having relations with your wife is on the night of Shabbat in order that your children live a long time.