Likutei Moharan 67:2/ליקוטי מוהר"ן ס״ז:ב׳

12. One must also ensure that glory has a face. Gluttony causes a blemish of glory, so that it has no face. This is because a person’s table is the aspect of the crown of kingship (Rashi on Yoma 72b), which corresponds to glory, as in “King of glory” (Psalms 24:10). Glory is thus the aspect of Malkhut (Kingship). When a person blemishes through eating, glory is blemished and has no face, as in “I will conceal My countenance [from them], and they will be devoured” (Deuteronomy 31:17). Gluttony, God forbid, is thus a concealment of the face.

2Conversely, restraint in eating, breaking one’s craving for food, brings a lifting up of the face As our Sages, of blessed memory, taught: “May God lift up His countenance toward you” (Numbers 6:26)—How can I not lift up My countenance toward the Jewish people? For I said, “You will eat and be satiated, and bless” (Deuteronomy 8:10), yet they are stringent even from an olive’s worth to an egg’s worth (Berakhot 20b). We see from this that breaking the desire for eating—being as stringent even from an olive’s worth to an egg’s worth—brings to a lifting up of the face.

3This is the meaning of “he spoke to me: This is the Table that is liphnei (before) God” (Ezekiel 41:22). Specifically “liPhNeI God”: the PaNIm (face) shines on account of one’s table—i.e., eating in holiness.