Perhaps, if the menu includes fatty fish like salmon or herring fish, walnuts, sugar beets, or beet molasses. Those foods contain substances that had an antidepressant effect in tests on rats, researchers report in the Feb. 15 issue of Biological Psychiatry. The substances are omega-3 fatty acids and uridine.bundant omega-3 fatty acids are found in certain fish -- especially in fatty fish like salmon and herring -- as well as walnuts and flaxseed. Uridine occurs in sugar beets and molasses made from those beets.