From the book Advice:#9
Rabbi Nachman: ADVICE (LIKUTEY ETZOT) by Rabbi Nathan of Breslov

Eating

(This one speaks of klipot and a good explanation)

9) The food —physical and spiritual —of the Jew must first undergo purification until not a trace of the forces of the Sitra Achra, the Other Side, remains. Food which still contains a trace of them can cause one to sin. All the impulses and desires which people experience are aspects of the kelipot, the “husks”which surround the spiritual fruit. The husks are characterized by excess and superfluousness. The body can survive without these gratifications. When desires and impulses press in on a person, this is the battle of the kelipot against holiness. The principal desires are for food and drink. All the other desires are derived from them. When a person is in their grip, they send his faculty of speech into exile. As it says in the Psalms: “My throat is dry”(69: 4). He finds himself unable to say a single word before God. But by fasting he can overcome the power of these desires. Then he will be able to speak. Through this he will be able to draw those who are far from God closer. As more people come to acknowledge God, His glory is revealed over the whole Creation, and our faith in God becomes complete. When a person who is master of his desires eats, it is precious indeed because of the unification brought about between the Holy One, blessed-be-He and the Shechinah face to face (62: 1,2,5). 10) When a person eats greedily it