A lifetime engaging in intellectually stimulating pursuits
may significantly lower your risk for dementia in your golden years, new research
suggests.
Even people with relatively low educational and
professional achievements can gain protection against late-life dementia if
they adopt a mentally stimulating lifestyle -- reading and playing music and
games, for example -- by the time they enter middle-age, the new study contends.
"In terms of preventing cognitive [mental]
impairment, education and occupation are important," said study lead
author Prashanthi Vemuri, an assistant professor of radiology at the Mayo
Clinic and Foundation in Rochester, Minn. "But so is intellectually stimulating
activity during mid- to late life," she added.
"This is very encouraging news, because even if you
don't have a lot of education, or get exposure to a lot of intellectual
stimulation during non-leisure activity, intellectual leisure activity later in
life can really help," she said.
Artistic endeavors -- including crafts -- participation in
group activities and computer work also benefit the aging brain, according to
the study, published in the June 23 online issue of JAMA Neurology.
Seniors in the United States accounted for roughly 35
million people in 2000, and that figure is projected to more than double by
2030, the study authors said. Keeping seniors' brains healthy is considered a
public health imperative.
To explore how routine intellectual "exercise"
might translate into a lower risk for age-related dementia, the team tracked
nearly 2,000 men and women between the ages of 70 and 89, who enrolled in a
Mayo Clinic aging investigation between 2004 and 2009.
Initial testing revealed that more than 1,700 of the
participants were "cognitively normal" at enrollment, while nearly
300 had "mild cognitive impairment." Cognition refers to thinking and
memory abilities.
All participants were subsequently "scored" on
their level of past educational achievements, while occupational histories were
ranked by degree of intellectual complexity.
Participants also completed questionnaires designed to
pinpoint how much they engaged in intellectually demanding activities during
the prior 12 months and during middle age (from age 50 to 65).
Lastly, all were examined to see if they carried a
specific variant of the APOE gene, considered the most significant genetic risk
factor for late-onset Alzheimer's.
At the time of the study's launch, mental functioning was
lower among carriers of the APOE4 genotype, and among those who scored lowest
on education, job, and/or activity measures, the researchers determined. Lower
mental functioning scores were also seen among older participants and men.
However, APOE4 carriers who ranked near the top in terms
of all measures of lifetime intellectual engagement -- including education,
occupation and activity routines -- saw their risk for dementia delayed by
nearly nine years, compared with those whose intellectual stimulation ranking
hovered near the bottom.
Digging deeper, Vemuri and her associates also found that
regardless of educational and professional background, all participants who
routinely engaged in intellectually stimulating activities in middle-age and
their later years also ended up seeing their relative risk for dementia drop.
The dementia protection afforded by routine intellectual
activity alone was weaker than when intellectual activity was also paired up
with stimulating jobs and education.
But in a twist, the authors found that those with the
lowest educational and occupational scores actually gained the most protection
against dementia by embarking on intellectual activities from middle-age
onward.
"This was a little surprising," said Vemuri.
"But it turns out that even if you don't have a lifetime of educational
and occupational development, intellectual activity in later life can really
help -- perhaps delaying cognitive impairment by at least three years."
Cheryl Grady, a professor with the University of Toronto's
department of psychology and psychiatry, said the findings are both
"interesting" and encouraging.
"The association between lower cognitive function and
lower education has been known for some time," she said. "But as far
as I know no one has [previously] shown that midlife cognitive activity and
education interact."
However, the association seen in this study does not prove
a cause-and-effect relationship.
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