hello thanks for consulting at hcm..Taste is one of our most robust senses.It helps us recognize when food is good or bad for us. loss of taste can cause a loss of appetite, especially in older adults, which can lead to loss of weight, poor nutrition, weakened immunity.medications-antibiotics or antihistamines or other medications may cause persistent bad taste in your mouth.adjust or change your medicine to one that will not cause a problem with taste. Use artificial saliva, frequent sips f water, non sucrose chewing gums if u have teeth or denture wearer,,these r symptomatic treatmnt,,if prblm persists plz consult an endocrinologist ,.hope t helps..tc