Diet seems to be a crucial player. In the past, several systematic reviews have found healthy diets, like the Mediterranean diet, are linked to a reduced risk of dementia. Meanwhile, the Western diet, which is high in saturated fat, sugar, and salt, seems to be a risk factor for dementia.

Research shows frailty levels rise significantly before dementia, suggesting it could be a key marker for early identification and prevention of dementia risk.

A study of more than 9,800 adults in their 70s showed that those with stable cholesterol levels had a "significantly lower" risk of dementia.