Asides from coffee, there are other like tea, sake and candy.Well, we don't absolutely need to eat them.But once you've try it, it becomes a habit.Luxury foods and drinks are, how do I say this? Not the kind of food and drinks you have in order to take in nutrients.Even the cola at Kourindou is a kind of luxury drink.They are something you consume for taste and flavor or stimulant effect rather than nourishment.If that is so, then everyone doesn't need to eat them.