As I recall, both gluttony and "drunkenness" are considered in the same league in the bible, even in the good 'ol NWT. I think they are both 2 of the seven deadly sins(?). In any event, we all know how JW's pick and choose their disfellowshipping offenses, failing to take into consideration the allegorical, cultural, and historical context of the scriptures. We know far more about the reality of addictions--including alcohol AND food addictions today than they did when they set the no-no's in Hebrew/NWT times.
It IS inconsistent to label cigarette smokers as worthy of disfellowshipping, but "guttony" and obesity as not. Very, very few reasons exist for the vast majority of obesity: it's simply chalked up to eating more than you consume. And based on my exp with the JW's, a LOT of them eat to much because they've got a lot of issues, conflicts, and pressures and they aren't encouraged to have a lot of relaxation outlets.