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The most common cause of lack of taste is an obstruction in the nose or allergies or cold/flu (because taste and smell go together). Beyond that, aging, Alzheimer's disease, cigarette smoking, Parkinson's Disease, fungal infections of the tongue, ear infections, deficiency in some vitamins and minerals (like B12, Folate, and Zinc), exposure to certain chemicals, head injury, dental problems, radiation to the head and neck -many different things. What is concerning is when anyone looses their sense of taste, they tend to undereat and become malnurished. I would encourage you to see an Ear, Nose, and Throat Physician to help you determine the cause of the lack of taste.