An earlier post addressed the nature of gluttony. One important point to emerge was that gluttony cannot be identified with the consumption of excessive amounts of food or drink. But what is wrong with it?
There are the worldling's reasons to avoid gluttony and there is no need to review them: the aesthetic reasons, the health reasons, and the safety reasons. These are good reasons, but non-ultimate.
The best reason to avoid gluttony, one that applies both to gluttony as excessive consumption and gluttony as inordinate concern for food, is that gluttony and other vices of the flesh interfere with the exercise of our higher nature, both intellectual and spiritual.
If you eat too much and die before your time you have merely shortened your animal life. Much worse is to blind your spiritual eye.