But a life marked by frequent and unexpected asthma attacks does not have to be the norm, especially if asthma sufferers make a conscious effort to incorporate anti-asthma superfoods into their normal diet. Here are 10 amazing superfoods that can help fight asthma naturally: 1) Avocado. The fruit with the highest known concentration of L-glutathione; avocado is an excellent anti-asthma food that helps protect cells against free radical damage and detoxify the body of pollutants and other harmful substances.