Alzheimers/dementia is now known to be very strongly linked to sugar intake.

Even mainstream media is being forced to concede this.

Here's a couple articles:
https://www.psychiatrist.com/news/sugary-foods-may-be-driving-alzheimers-study-suggests/
https://pmc.ncbi.nlm.nih.gov/articles/PMC10921393/
https://www.healthline.com/health/alzheimers/sugar-and-alzheimers