Is it cheap corn that makes Americans fat?

Read here. Here is a short bit on the scientific developments behind cheap corn. I wouldn't want to take any of these developments back, as they have saved millions of lives around the world. Nonetheless the biological/behavioral arguments for market failure are growing in importance (human beings did not evolve to handle fully abundant fats and sugars), relative to the traditional externalities arguments. If you don't believe me, check back in thirty years.