The meaning of gluttony has changed since this list was first devised. Over-eating, as we understand gluttony, wasn't much of a problem in the sixth or seventh century. Most ordinary people were struggling just to ward off starvation. In the New Testament, a glutton is defined as a person who proves to be a rascal or scoundrel because of an inordinate fondness for something. The seventh and final of the Seven Deadly Sins is the All-American favorite, greed.
Greed starts innocently enough, with motivation.
It is the recognition of our needs and wants. We get the notion that if we just acquired enough stuff, we'd really be happy. We could find life's deepest meaning in our stuff. That's the deceptive trick greed pulls on us. It never has all its wants and desires met.