Pregnant with her second child, Kelly Muzyczka found herself feeling more and more irritable and less focused as the days passed. Because her negative mood often showed up after eating certain foods, particularly those higher in carbohydrates, the Pittsburgh woman figured a diet change was in order.

"It seemed a logical step that if I could see one set of emotional reactions to diet, then my depression might be treatable," says Muzyczka, who ultimately lowered her carb intake and began eating a higher-protein diet.

Muzyczka discovered, to her surprise, that the changes she made were right on. "I went for about two weeks where I was fighting with my husband, crying all the time," she says.

"One day I realized that although I was telling people how great I was feeling, how happy we were about the new baby, I wasn't feeling it at all. I wasn't enjoying my older child – I wasn't feeling much of anything. Changing my diet made me a different person, it was startling. The crying went away, I was happy again, it was just amazing."

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