If you think diabetes and obesity are the two biggest health care crises Americans face these days, you're missing the forest for the trees--literally. Because the roots of all this diet-induced disease lie in two less publicized but even more pernicious epidemics: nature deficit disorder and kitchen illiteracy.

The symptoms include a woeful lack of familiarity with that elusive culinary commodity known as "real food," or "good food," or "slow food," and total estrangement...