Research shows there is a link between education and Alzheimer's disease.

A recent study found older adults with the most schooling had the lowest dementia rates, and the average education level increased during the the study years.

The new research documents show another decline in dementia rates, but experts say the rising numbers of older Americans may stop that trend unless better ways are found to keep brains healthy.

Led by University of Michigan researchers, the study was published in JAMA Internal Medicine. The National Institute on Aging paid for the research.

The study shows the rate of Alzheimer's disease and other dementias in adults age 65 and older dropped about 9 percent in 2012 from nearly 12 percent in 2000, continuing a decline noted in earlier research.

Alzheimer's is the most common form of dementia, which can also be caused by strokes, Parkinson's disease and other conditions.

Researchers analyzed nationally representative government surveys of about 10,500 older adults in both years, including some living in nursing homes. They were interviewed and given mental tests by phone or in person; spouses or relatives responded for those impaired by dementia or other illness.

The dementia rate declined amid a rise in diabetes and heart disease. Both increase risks for Alzheimer's and other dementias, but the researchers say better treatment for both diseases may explain the results.

Obesity rates also increased while dementia was most common among adults underweight. Previous research has shown weight loss may precede dementia by several years and that late-life obesity may be healthier than being underweight. But a journal editorial says more research is needed to determine whether the excess pounds in older age somehow protect the brain.

Dementia was most common in the oldest adults.

In 2012, almost 30 percent of adults 85 and older were afflicted versus just 3 percent of those between the ages of 65 and 74. The number of adults age 85 and older is rapidly rising and is expected to triple by mid-century.

The Alzheimer's Association estimates about 5 million people 65 and older have Alzheimer's, and that is expected to rise to almost 14 million by 2050.

Previous studies have found less dementia in highly educated people, but it is not known whether education somehow protects the brain from dementia or if it helps people compensate for brain changes linked to Alzheimer's or other dementias.

Experts tell us there are ways to help keep your brain healthy: avoid smoking, eat healthy and get plenty of excercise. Experts also advise staying mentally active: Take a class, learn a new skill or hobby.

Steen Wackerhausen Thinkstock
Steen Wackerhausen Thinkstock
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