More than half of adults living in the U.S. label themselves as "mouth breathers"—breathing primarily through an open mouth. However, according to research, breathing through the nose leads to several benefits, including lower blood pressure and other factors that could predict heart disease risk. Blood pressure and heart rate can be predictors of heart disease. Breathing patterns can affect these bodily functions due to the crosstalk that occurs between the respiratory and cardiovascular systems. Nasal breathing has been shown to relax the airways and improve breathing efficiency. A group of 20 young adult volunteers participated in a crossover study consisting...