In a new study researchers have found a connection between exacerbation of bronchial asthma and high calorie burgers and fries. Diet and lifestyle have been linked to asthma for some time now but this is the first real evidence. With the advent of unhealthy diets the incidence and prevalence of asthma is on the rise. In 2007, about 34.1 million Americans had asthma, according to the American Academy of Allergy, Asthma and Immunology. From 1980 through 1994, the prevalence of asthma increased by 75 percent.