While memory loss is the most recognized symptom of Alzheimer’s disease, new research suggests a subtler sign may appear first: the loss of smell. According to Professor Davangere Devanand of Columbia University, struggling to recognize familiar scents—like your usual shower gel—could signal early cognitive decline.
Smell is deeply connected to memory. The brain regions responsible for scent recognition are often among the first affected in early Alzheimer’s.
In a long-term study involving over 1,000 participants, researchers used a simple smell test to detect warning signs. Participants were asked to identify 12 common scents such as soap, smoke, rose, and leather.
Those who scored below 8 out of 12 were significantly more likely to develop cognitive impairment over time.
This basic smell test, especially when combined with a short memory assessment, proved as effective as MRI scans and more complex evaluations.
It’s also affordable, non-invasive, and could be used in routine doctor visits to flag early warning signs.
Key scents to pay attention to include soap, gas, lilac, lemon, cherry, and menthol. If you consistently fail to recognize several—particularly familiar ones—it may be worth discussing with your doctor.
Your shower might reveal more about your brain health than you realize.