How the smell of your urine could help diagnose dementia: Unique odor 'appears before Alzheimer's disease sets in' Urine takes on a unique smell before dementia kicks in, a study foundThis finding could help diagnose Alzheimer's before brain declineIt could also pave the way for treatments to slow the disease's progression An odor in urine can signal whether a person is likely to develop Alzheimer’s disease, scientists revealed. A unique smell ...