> It refers to the price of calories See: potatoes. They're basically pure calories and they're several times cheaper than any junk food. Junk food is the mo

> It refers to the price of calories See: potatoes. They're basically pure calories and they're several times cheaper than any junk food. Junk food is the most expensive food no matter how you slice it. The only metric by which junk food might win is in the lazy glutton category; if somebody is too lazy to put a potato in their oven 45 minutes before their meal, then a bag of potato chips has an advantage. But in no other sense is junk food more efficient. And even for lazy people, there are plenty of cheap as dirt veggies that require less cooking or no cooking at all. A bag of apples is a very cheap way of getting a sugar rush without any food prep, but fat people would rather spend that money on several gallons of cola a week.