Whats more, people who have chronic nasal and sinus problems including allergies, nasal polyps, or chronic sinus inflammation can have more severe and earlier impairment in their sense of smell,Benninger says. And some neurodegenerative disorders, such as Parkinsons and Alzheimers, are associated with a reduced ability to smell, notes Alan Hirsch, M.D., neurological director of the Smell & Taste Treatment and Research Foundation in Chicago.
Taking certain medications like some antidepressants, tranquilizers, antibiotics, antihistamines, anti-hypertensive, and anti-cholinergic drugs can also take a toll. And deficiencies in various nutrients, including vitamin B-12 and vitamin D, are associated with olfactory dysfunction,Turner notes. In fact, a