I don't advocate for disfellowshipping, but the principle for disfellowshipping for smoking applies to overeating or eating food known to be unhealthy or that leads to heart disease, diabetes, etc.
There are factors that make gluttony or overeating a serious offense. In the case of one who gluttonously overeats, his desire for food has gotten out of control. He greedily consumes it without consideration for the fact that he has no right to misuse God’s gifts. Hence, by disobediently overindulging in food and making a glutton of himself, he fails to show love for Jehovah God. Why so? Because, as the Bible says: “This is what the love of God means, that we observe his commandments.”—1 John 5:3. Watchtower, March 15, 1974
What is the quickest way to tell if someone overeats? Simple - the person is overweight. If you consume more than your body needs you are overeating.