Judith,
What ISP said was always the reason (or often, the excuse) I heard. For example, "Poor brother fatso, he must have a GLANDULAR disorder leading to him being such a large size." Or, "I know some people who eat like pigs and never gain an ounce!!"
So I guess it isn't just weight alone that determines gluttony. If you want a serious answer to this question, I couldn't find a scripture explicitly stating "Gluttons shall not inherit the kingdom".
But I found a couple of verses that may apply. 1 Corinthians 5:11 says to quit mixing in company with, among other things, greedy persons. You could suppose that a glutton is 'greedy' for food, and you'd be correct.
The other verse that would discourage serious JW's from visiting the buffet 7 times a week is found at Titus 1:12,13. In verse 12 Paul tells us that a prophet of Crete calls his own people "always liars, injurious wild beasts, unemployed gluttons". Then in the next verse he says to keep reproving people with that spirit, that they may be healthy in the faith.
I'd say it's good to avoid gluttony, just to be healthy period!
[edited for spelling]
GopherWhy shouldn't truth be stranger than fiction? Fiction, after all, has to make sense.
Mark Twain (1835-1910)