We Americans love our food. It's part of what has made this nation great. Our fertile farmlands and the abundance and variety of our agricultural output are the envy of the world. For most of our history, we lived close to the land, food was accessed locally, and we processed it in our own kitchens. But as our population and economy has boomed in the last century and we concentrated in cities, we industrialized our food system--with food coming far from home and processed multiple times. As foods rich in natural taste declined, we relied on high amounts of added sugar, fat, and salt to entice...