Longevity experts identify habit linked to fewer memory problems in one of the world’s Blue Zones

Walking more and sitting less were linked to fewer subjective memory complaints among older people living independently in Sardinia, one of the world’s Blue Zones, according to a study by the University of Cagliari.

The researchers studied 118 residents from different Sardinian communities. Their average age was 87, with participants ranging from 65 to 101. The study focused on subjective memory complaints, meaning a person’s perception that they forget more often or that their memory works less well than before.

The team assessed five possible predictors: physical activity, sedentary time, sleep efficiency, perceived physical health, and confidence in one’s memory. Four were associated with fewer complaints: a better perception of physical health, greater confidence in memory, more daily steps, and less time spent sedentary.

To measure movement, participants wore an accelerometer continuously for seven days, except during personal hygiene or water-related activities. The device recorded both their steps and the amount of time they remained still. Those who walked more and sat less were less likely to report subjective memory problems.

The researchers suggested that walking and other physical activity could support blood flow to the brain, help maintain certain brain structures, and stimulate mechanisms linked to brain-derived neurotrophic factor, a protein associated with neuron health. They also noted possible links with better metabolic control and lower cardiac risk. More mobility may reflect an active daily life involving social contact, movement between places, and environmental stimulation.