Scientific American interviews Gregory Asnis, M.D., on a new study that shows a link between diets with low levels of omega-3, the unsaturated fat most commonly found in fish, and depressive behavior in mice. Dr. Asnis notes that while depression has many causes, the study shows promise and will spur the exploration of the link in humans. Dr. Asnis is professor of psychiatry and behavioral sciences at Einstein and director of the Anxiety and Depression Clinic at Montefiore Medical Center.