What could cause the sense of taste to change?

Loss of smell/taste: Anosmia which is loss of smell can be associated with medical conditions such as flu, Parkinson disease, stroke, head trauma, cerebral contusion, old age, Alzheimer, bells palsy, smell and taste are connected, if you cant smell you normally cannot taste. Spicy foods work. Condition may be dangerous because smoke cannot be detected. Olfactory nerve transmits smell,may be affected by tumor/trauma