My new avatar explained

[John 6IX Breezy]

I think most bad habits have good reasons. Meaning, the habits themselves are good, but what they have been applied to is perhaps not. For example, we have bodies that protect against malnutrition, therefore eating habits that might be beneficial in scarcity are problematic in surplus. You mentioned gluttony; I would argue that the habit itself isn't the problem, its the easy access to excess food.