3% in rural India vs 19% in rural Pennsylvania
Rural India has the high turmeric/curry diet.
“3% in rural India vs 19% in rural Pennsylvania”
Not to downplay the possibility that Turmeric and and Curry may have significant health benefits, but the average lifespan in rural India is late 60s versus late 70s in the USA.
This is also the age when symptoms of dementia become more prominent and diagnosable.
“3% (incidence of Alzheimer”s) in rural India vs 19% in rural Pennsylvania”
Life expectancy is much lower in rural India, so some number may just die of other causes, before they might have developed Alzheimer’s.
Notwithstanding any potential confounding factors with that, the results published in the Nature article are dynamite - Nobel Prize potential.