http://www.43things.com/things/view/743662/learn-about-urban-legends

Scroll down page to find story written by Barbara Mikkelsen of Snopes.

I'm surprised Bob's friend's doctor didn't tell him that he is probably allergic to various mold toxins, which is the most likely culprit in pancake mix - not some mysterious chemical change.

The moral of the story is, if your food tastes weird - don't eat it.