An obese doctor comes home to his wife at dinner time carrying yet another bag full of drive-through junk food from a local restaurant.

Worried about his health, his wife asks, “Don’t you realize all that junk food you keep eating is destroying your entire body?”

“That’s not my concern,” the doctor replies. “I’m only an ear, nose and throat specialist.”

This joke illustrates an important point: That even the most brilliant scientists, doctors and researchers can seem downright clueless when it comes to their own health. And this joke isn’t really a joke at all: It’s a sad but true commentary about the blind spots in the knowledge of those who are among society’s most intelligent thinkers.

I’ve known many brilliant people. Even a few geniuses. But rarely do I meet anyone whose knowledge of food and nutrition rises very far above outright ignorance. Perhaps one in a hundred people in the western world today have taken it upon themselves to actually learn about foods and health — the rest simply wing it, going along with the mainstream. (And the mainstream is diseased…)