Sunday at 9p ET on Fox Files, actress Jennifer Esposito, from the hit show Blue Bloods, shares her struggle with celiac disease with Arthel Neville. This medical mystery affects an estimated three million Americans and experts say it can be triggered by foods that contain gluten. Esposito also speaks exclusively with Fox Files about her ongoing behind-the-scenes turmoil on the hit police drama which she says is due to her health.

Watch a sneak peek below and tune in to Fox Files, Sunday at 9p ET.