In a recently study of dementia, researchers in the UK found that adults who walked about 9,800 steps per day at a higher cadence saw a measurable decrease in dementia incidence risk compared other walking amounts. In a weird coincidence, 9,800 steps is just shy of the magical 10,000 steps a day we’re “supposed to walk” — a number plucked out of the blue by the marketing department of a Japanese exercise equipment company several decades ago.