MargaretTay
I think carbohydrates are the devil. Lots of people I know who have dementia ate a high carb diet
I’ve no scientific proof of course
there is some truth in what you say MargaretTay, but onluy some truth. There is a higher risk of dememntia if you eat a lot of refined carbohydrates, white flour sugar etc and if more than 25% of you diet comes from UPF.
However a diet high in complex carbohydrates found in vegetables, fruit, and legumes are generally associated with a lower risk of cognitive decline.
Can you give us more information on the types of carbohydrates your friends were eating and for how long?
However this diet will only lead to an increase in risk, it doesn't make it certain and it has to be seen in the context of a lifetimes eating pattern.
A person in extreme old age, widowed and lonely, may develop a diet of easily eaten unchallenging food based on bread and sugary foods, but if they have eaten a well balanced diet for their first 80 years, the effect on cognition will be far less than if they have always lived on bread and potatoes with little fruit and veg.
The variables underneath your statement are so diverse and complex, I think you need to do a bit more research before making such sweeping statements.