The loss of the sense of smell (anosmia) affects the sense of taste as well. This is very common in patients who had chemotherapy who lose weight due to appetite loss. Smoking also damages the hairs in the respiratory tract epithelium and hence may cause problems with sell and taste. Other causes include nasal polyps, sinusitis or blocked nasal passages, gum disease, head trauma, upper respiratory tract infection or URTI, space occupying lesion in the brain, or aging. Go to an ENT or ear, nose, throat physician for further evaluation. Treatment includes treatment of the cause, stop smoking or removal of a nasal polyp.
When your sense, both taste and smell both disappear, it means that you have ingested a certain chemical and that's why your taste and smelling senses have been blocked. A change of diet so that you may include a lot of fresh fruits and veggies will allow your body to begin detoxing years of accumulated toxins. Once you have done this, allow your body to slowly flush out the unnecessary toxins so that your lost senses may be regenerated back.