If you think you have a food allergy, there is one very important thing you must do first: Make an appointment to see a board-certified allergist.

Ask Oprah's All Stars hosted by Gayle King expose the top Myths, Secrets and Confessions!

At 14, Mary Williams moved from the poverty-scathed streets of East Oakland to Jane Fonda's hacienda in Santa Monica. Decades later, Williams returns home to find out if blood really is thicker than water.

Oprah Radio host Dr. Mehmet Oz talks with Dr. Dave Resnick about the increase in allergy and asthma cases and methods of treating patients.

O's beauty director, Val Monroe, on how to avoid an allergic reaction to makeup.