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The Western diet composed of seed oils, sugar and refined carbs (also fed to patients in care homes and hospitals) may initiate dementia. Intermittent fasting, low carb, low sugar diets may prevent and hypothetically reverse dementia.
Fasting induces ketosis which reduces beta amyloid plaques and tau -
Dr Paul Mason - Reversing Dementia With Diet - A 2021 Update -
https://m.youtube.com/watch?v=muAvJ1y64PA
Finally, regular consumption of small amounts of turmeric powder may reverse dementia symptoms -
https://nutritionfacts.org/blog/can-turmeric-help-with-alzheimers/
I hope the above links can help someone.