查了下, 没有有力证据证明两者有关系

Metals, aluminium and dementia

At present, there is no strong evidence to support the fears that coming in to contact with metals through using equipment or through food or water increases your risk of developing Alzheimer's disease.

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It is also unclear whether reducing metals in the brain via drugs or reducing our exposure would have any effect. These metals are essential to the healthy function of our brain

Link: https://www.alzheimers.org.uk/about-dementia/risk-factors-and-prevention/metals-and-dementia