Commutes were excluded, meaning the analysis focused on how people moved during their free time when they were allowed to more freely choose how to get from place to place.

So, the numbers below might actually be higher than reported?

Cyclists had a 19 percent lower risk of all-cause dementia, 22 percent lower for Alzheimer’s specifically, a massive 40 percent lower risk for early-onset dementia, defined as dementia that hits before the age of 65, and 17 percent lower for the standard late-onset.