Avoiding certain foods goes far beyond dietary restrictions; it is a practice that deeply shapes a person's soul, moral character, and even their future descendants. The strict prohibition against consuming blood illustrates how food forms a person's spiritual identity and impacts their ability to serve God completely. The explicit warning against eating the blood of animal organs [רש"י] served a vital historical purpose. It was designed to sever the Israelites from the idolatrous practices of the era, where consuming blood was a common method used to draw closer to false gods [העמק דבר]. Beyond this historical and literal meaning, sages also found an underlying hint pointing to the prohibition of mixing meat and milk, which similarly represents a forbidden blending of species [תורה תמימה, שפתי חכמים].
The promise of well-being for the individual and their children highlights the profound psychological and moral consequences of consumption. The primary approach among commentators is that eating blood, which contains the life force of the animal, infuses a person with animalistic traits. It distorts the mind and dulls pure thought, preventing clear, spiritual contemplation [אבן עזרא, אבי עזר, ביאור יש"ר]. Furthermore, blood naturally breeds cruelty within the one who consumes it. Because a parent's nature, character traits, and temperament are passed down to their children, avoiding blood ensures that cruelty does not take root as a permanent family trait. Instead, it preserves the natural quality of mercy from generation to generation [כלי יקר, רלב"ג].
On a deeper, more spiritual level, blood symbolizes the raw vitality, enthusiasm, and materialism of the physical world. While meat itself can be elevated to holiness when consumed with pure intentions, the pure life force of blood cannot be ingested for physical pleasure without dragging a person down to an animalistic state. Therefore, blood must be dedicated exclusively to spiritual purposes, such as its use on the altar. This teaches that human enthusiasm should be channeled toward holiness rather than base material desires [חומש קה"ת].
The requirement to do what is right in God's eyes introduces a crucial element of intent. Many commentators emphasize that it is insufficient to avoid blood merely out of natural disgust. A person must train themselves to declare that they are abstaining solely because God decreed it [ספורנו, רבנו בחיי, תיבת גמא]. By elevating this natural revulsion into a formal Commandment, the Torah provides an opportunity for reward. Without an explicit command, people would avoid blood naturally and receive no spiritual merit [אלשיך]. Additionally, acting uprightly before God parallels acting uprightly before humanity; one who is pleasing to people is also pleasing to God [ברטנורא].
This dynamic reveals a profound principle regarding the reward for fulfilling Commandments. If an individual receives such immense reward, both for themselves and their descendants, merely for avoiding a substance that the human soul naturally finds repulsive, the implication for other areas of life is staggering. One will surely receive an infinitely greater reward and generational blessing for conquering their impulses and refraining from sins that human nature naturally craves, such as theft or forbidden relationships [רש"י, רבנו בחיי, תורה תמימה].