be better than you think.
"This is good news for aging baby boomers," Kenneth Langa, MD, PhD,
associate professor of medicine at the University of Michigan and the Ann Arbor
VA Health System, tells WebMD.
Langa's team studied cognitive impairment among people aged 70 and older in
the U.S. not living in nursing homes or other institutions. The researchers
defined cognitive impairment as memory loss on a scale similar to that seen in
dementia -- not mild memory loss.
For the study, some 7,400 people took memory tests in 1993. About 7,100
other people took the same tests in 2002.
"What we found is that the risk for someone who was 70 and older in 1993
of having impaired cognition was higher than the risk for someone in that same
age group in 2002," says Langa.
Schooling, Heart Health
The study doesn't show why serious memory loss was less likely among the
later generation. But Langa's team has some theories.
"We think the decrease in the risk that people would become
significantly impaired or get dementia is due to a few things: the significant
increase in education level between the two cohorts and also likely a better
job of treating cardiovascular risks like hypertension and high
cholesterol," says Langa.
In short, more education may help keep the brain sharp, and tending to heart
health can be good for the brain. Other factors also affect brain health; Langa
and colleagues didn't have data on all of those factors.
The findings are all about individual risk. But even with a lower individual
risk, Langa foresees a rise in Alzheimer's and other dementia cases.
That's because the U.S. population is aging. About 80 million baby boomers
will reach age 70 in the next eight or 10 years, and with an aging population,
"there's going to be a large increase in the number of people with
Alzheimer's disease and dementia, even with a decreased [individual] risk,"
That is, individual risk may be lower than in the past, but there are many
more individuals, so the net result is more cases. Last year,
another report predicted that Alzheimer's cases will triple by 2050.
Langa notes that further studies are needed on cognitive impairment among
people in nursing homes. Meanwhile, Langa's current study appears online in
Alzheimer's & Dementia.
By Miranda Hitti
Reviewed by Louise Chang
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