#4 natural way to curb the Flu: Ye Olde Chicken Soup to help with Flu? According to a study by U of Nebraska, researchers found that it can indeed relieve symptoms of an upper resp. tract infection. Soup eased the inflammation of throat cells that can cause cold symptoms. Many veggies in soups, like onions, have anti-inflammatory properties. Add some ginseng, which has shown to cut severity of cold symptoms by 50%