1)
Why "Lo Yada Shalev b'Vitno"?
1.
Rashi: His stomach is never serene. It always tells him 'steal and bring [food] to fill me.'
2.
Malbim: He does not benefit from his food. Since he is a glutton, his stomach is never serene. It always wants to eat much.
2)
What is the meaning of "ba'Chamudo Lo Yimalet"?
1.
Rashi: He covets quality meat, and constantly diminishes. This is like "va'Temes ka'Ash Chamudo."
2.
Ibn Ezra: His desire did not leave over anything.
3.
Malbim: He desires that his stomach will never expel the food. Amidst gluttony, he wants that the food will always remain in his stomach.
