Proverbs 23:20–21 (ESV)
Be not among drunkards or among gluttonous eaters of meat, for the drunkard and the glutton will come to poverty, and slumber will clothe them with rags.
Is it bad to be a glutton?
Gluttony (Latin: gula, derived from the Latin gluttire meaning "to gulp down or swallow") means over-indulgence and over-consumption of food, drink, or wealth items, particularly as status symbols. In Christianity, it is considered a sin if the excessive desire for food causes it to be withheld from the needy.
What makes you a glutton?
Gluttony is the excessive consumption that deprives another being of a life-giving necessity. Gluttons devour more, leaving others with less. It's immoderation. Beyond consumption, gluttony describes worship of food and deriving excessive pleasure from it.