Which factor is NOT recognized as a potential asthma trigger?

Regular dietary changes are not typically recognized as a direct asthma trigger in the same way that environmental pollutants, strong emotional expressions, and allergens like dust or mold are. Asthma triggers are often linked to immediate reactions or exposures that exacerbate the condition, and while diet can influence overall health and may affect asthma indirectly through weight management or general inflammation, specific dietary changes do not usually incite an acute asthma episode. In contrast, environmental pollutants, such as smoke and smog, can irritate the airways; strong emotional expressions, including stress or laughter, can lead to bronchospasms; and allergens, like dust mites and mold, can provoke allergic responses that trigger asthma symptoms. Each of these factors has a well-established mechanism by which it can worsen asthma, whereas dietary changes lack this direct relationship.