Learning genuinely new skills (a language, an instrument, a craft) builds cognitive reserve more than repeating familiar activities, however enjoyable those are.

Regular meaningful social contact is one of the more consistently protective factors against cognitive decline identified in dementia-risk research.

Aerobic exercise increases blood flow to the brain and is linked to better cognitive outcomes — see the Fitness Hub for structured programs.

Deep sleep is when the brain clears metabolic waste products via the glymphatic system — chronic poor sleep is an increasingly studied risk factor for later cognitive decline. See the Sleep Hub.

Hypertension, smoking, and metabolic issues affect the brain's blood supply just as they affect the heart — managing them is a recognized modifiable dementia-risk lever.

Chronic stress elevates cortisol, which in excess is associated with effects on memory-related brain regions over time — breathwork and other stress-reduction practices may help.