Fiber may keep you regular, but it may well keep your lungs healthy, too. People who eat more fiber (17.5 grams or more a day) from fruit, vegetables, legumes, and whole grains are less likely to develop lung disease, say researchers at the University of Nebraska Medical Center. This easy dietary change also reduces inflammation in the body—a risk factor for lung disease (as well as heart disease and cancer). In fact, boosting your fiber intake may be just as important to healthy breathing, say researchers, as is not smoking.