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.

Older adults who reported excessive daytime sleepiness and a lack of enthusiasm were more likely to develop a condition that increases the risk of dementia.

A new study has linked asthma in children to memory problems, with researchers warning that the early onset of the condition could exacerbate the issues and increase the risk of dementia