I'd posted an article by Gretchen Reynolds about walking maybe staving off cancer.
And now she points out that walking is good for general brain health, too.
Staying physically active may protect the aging brain
The study — which tracked how often older people moved or sat, then looked deep inside their brains after they died — found that certain vital immune cells worked differently in the brains of older people who were active compared with their more sedentary peers. Physical activity seemed to influence their brain’s health, their thinking abilities and whether they experienced the memory loss of Alzheimer’s disease.
https://www.sanjuandailystar.com/pos...he-aging-brain