Does Alzheimer's Start in the Nose? A New Theory on the Disease

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1) Sense of Smell Deteriorates Very Early

Many patients experience a deterioration of their sense of smell several years before memory problems.

Studies show that:

• loss of smell can occur 5–10 years before diagnosis

• changes are visible in the olfactory nerve and olfactory bulb.

The structure first affected is often the

Olfactory bulb, located just above the nasal cavity.

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2) Direct Path from Nose to Brain