Recent research shows using an in-home HEPA purifier for one month spurs a small but significant improvement in brain function in adults age 40 and older.
HEPA purifiers remove particulate matter, like various pollutants, from the air. Exposure to particulate matter has been connected to respiratory and cardiovascular illnesses as well as neurological diseases such as Alzheimer’s and Parkinson’s. Environmental health researchers increasingly recommend that people use HEPA air purifiers in their homes to lower their exposure to particulate matter.
The researchers analysed data from a study of 119 people ages 30 to 74 living in Somerville, Massachusetts. Somerville sits along Interstate 93 and Route 28, two major highways, resulting in relatively high levels of traffic-related air pollution.
The study group was divided into two parts. One used a HEPA air purifier for one month and then a sham air purifier – which looked and acted like the real thing but did not contain the air-cleaning filter – for one month, with a monthlong break in between. The second group used the real and sham purifiers in reverse order. After each month, participants took a test that measured different aspects of their mental capacity. The test probed people’s visual memory and motor speed skills.
They found that the participants 40 years and older completed the section testing for mental flexibility and executive function 12% faster after using the HEPA purifier than after using the sham purifier. This improvement may seem small, even small decreases in cognitive functioning may be associated with a higher risk of death.
Other ways to boost brain function include:
1. Move Your Body
Regular physical activity increases blood flow to the brain, delivering oxygen and nutrients that support brain cells. Walking, swimming, cycling and strength training have all been linked to improved memory and thinking skills.
2. Prioritise Sleep
Sleep is when the brain consolidates memories, clears waste products and recharges for the day ahead. Most adults need seven to nine hours of quality sleep each night for optimal cognitive function.
3. Eat for Brain Health
A diet rich in vegetables, fruit, whole grains, nuts, olive oil and oily fish provides nutrients that support brain performance. Omega-3 fatty acids, antioxidants and B vitamins are particularly important for cognitive health.
4. Challenge Your Mind
Learning a new skill, tackling puzzles, reading or studying a language helps create new neural connections and keeps the brain active. Mental stimulation may also help build cognitive reserve as we age.
5. Stay Socially Connected
Meaningful social interactions engage multiple areas of the brain and can help reduce stress. Spending time with friends, family and community groups has been associated with better cognitive function and a lower risk of cognitive decline.
