About the use of the spice Turmeric for the prevention of dementia, Alzheimer's and memory problems...https://www.newsmaxhealth.com/headlin...mo_code=E8C5-1

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Whilst agreeing that Curcumin helps with dementia,quoting India as a good example is rather weak as the average lifespan is only 64 years, which lowers the odds of getting AD and dementia considerably.

Good point!

One of the reasons why curcumin helps dementia patients is that it is able to bind with the VITAMIN D RECEPTOR.
So people who regularly consume curcumin are in fact compensating for their vitamin D deficiency by providing an alternative.
Average dietary intake of turmeric in the Indian population may range between 2 to 2.5 grams, corresponding to 60 to 200 milligrams of curcumin daily. It may be the reason when people from India/Pakistan immigrate into the UK they don't suffer quite as much from the lack if vitamin d moving further from the equator inevitably means because those who maintain their traditional diet, with it's reliance on Turmeric, are to some extent protected from the effects of vitamin D deficiency.

Both vitamin D and curcumin help the brain clear Amyloid Beta.
In fact they work better together than separately
1alpha,25-dihydroxyvitamin D3 interacts with curcuminoids to stimulate amyloid-beta clearance by macrophages of Alzheimer's disease patients.