Plant-based diets help prevent and treat asthma, according to a review published in Nutrition in Clinical Care. Researchers from the Physicians Committee examined the evidence related to asthma and dietary factors among adults and children. The prevalence of asthma rose over the years as high-fat, Westernized diets increased in popularity. Diets that emphasize fruits, vegetables, grains, and legumes and minimize saturated fat reduce the risk for asthma and may improve asthma control.