A profound gap exists between the deep satisfaction of a good person and the endless cravings of a bad person, a difference clearly seen in how they approach their food. This contrast goes far beyond the amount of food consumed; it highlights the vast difference between seeking basic nourishment and chasing after unlimited luxuries.
A righteous person eats only the exact amount needed to sustain his body and soul, willingly leaving any extra behind [אלשיך, ביאור שטיינזלץ, מלבי״ם, עמנואל הרומי]. Instead of chasing fancy delicacies, he is completely content with simple meals that fill him [מצודת דוד]. Because he is happy with little and maintains a close relationship with God, he always secures his livelihood and goes through life feeling full and calm [רש״י, רלב״ג]. Even during times of famine or general hardship, he barely feels the struggle, as his modest habits allow him to be fully satisfied with very little [אלשיך].
In sharp contrast, a wicked person eats simply to stuff his stomach and satisfy his physical urges. Since material desire has no natural limit, he never reaches a point of true satisfaction. He constantly craves more rich foods and always feels as though he is missing something, walking away from the table feeling as if his stomach is still empty [אלשיך, ביאור שטיינזלץ, מלבי״ם, מצודת דוד]. Furthermore, because the wicked often rely on theft and violence to get what they want, they ultimately face divine punishment from God, which leads them to a state of literal starvation and poverty [רלב״ג, אבן עזרא, עמנואל הרומי].
This difference in habits also carries natural health consequences. While the righteous person eats in a measured, orderly way to stay healthy so he can properly serve God, the wicked overeat to the point of illness. Their gluttony causes them to become sick, forcing them to empty their stomachs or seek medical treatments that leave them physically hollow and depleted [חומת אנך, עמנואל הרומי].
Beyond physical meals, this concept extends to spiritual nourishment. A righteous person takes in wisdom and spirituality in a proper, healthy measure. He absorbs only what his mind can safely process, satisfying his inner self without damaging his core beliefs. The wicked, however, either remain entirely starved of true wisdom or push too far past healthy boundaries. As a result, they lose their faith entirely and end up even emptier than before [מלבי״ם, עמנואל הרומי]. Some commentators note that this deep-seated physical drive begins before birth; the wicked are driven by material urges while still in the womb, already lacking the spiritual depth that defines the righteous [חומת אנך].