One recent study of 183 people linked Alzheimer’s risk with an inability to detect 10 common scents: menthol, clove, leather, strawberry, lilac, pineapple, smoke, soap, grape, or lemon.

Another recent study of more than 90 people found those with a confirmed diagnosis of early-stage Alzheimer’s had difficulty smelling a spoonful of peanut butter a short distances from their nose.