The Church Fathers say we may sin with gluttony in food in four ways, as the Scholastics (including Thomas Aquinas) say. -
"Prae-propere, laute, nimis, ardenter, studiose"
too soon, too expensively, too much, too eagerly,
too daintily.
These are the guidelines with gluttony in food. You can eat only one egg, but if you fret and make people go through hell and high water to get you it
just right, it's gluttony. This is
too daintily.
If you have inordinately expensive tastes on a regular basis (I'm not talking about a nice dinner with your spouse or a special occaision) it is gluttony with food. This is too expensively.
Overeating is gluttony, as in, when you are already definitely sure you are full, and yet eat more. This is
too much.
If you gulp down your food and don't take breathing space, it is gluttony. Many of the saints in their penances made a penance not out of fasting, but many times just eating slower with the same amount of food, which helps them discipline and mortify their appetites. This is
too greedily.
You commit gluttony in eating too soon are those who eat in unopportune times, usually breaking hospitality when it comes to guests.
Good table manners is a subject covered in Ecclesiasticus. I would look up that.
Here is newadvent on it. It's a good article. As many of you have already observed, there is a spiritual gluttony that John of the Cross speaks of, which can be common among beginners in the life of grace.
http://www.newadvent.org/cathen/06590a.htm