They consume. That's all they do. It never occurs to them that something can be fixed by not consuming (this applies to much more than just food) they think to fix any issue in their lives they need to consume more. Be it food, clothes, drugs, whatever, they think the answers lie in spending more money. That's why they demand name brand gym clothes, they think not having nice stuff is what's hampering their progress. They never blame themselves and think consumption is the only way to move forward in life.