[ericpauley]

Food groups seem like such a strange way to quantify this, especially given that production of several of the food groups is a net macronutrient destroyer.

The macronutrient story is far more telling. For instance my math says (based on 17B bushel annual production) that the US produces 11,400 calories and 250g protein per person, per day, just in corn. The vast majority of this is used for animal feed and ethanol.

Whether resorting to eating just corn and multivitamins is a good life could be debated, but it's silly to suggest (as the paper figures do) that the US has a food security issue.