Speaking two languages can help delay the onset of Alzheimer’s symptoms by as much as five years.
The study conducted by Canadian scientists found more dramatic evidence that those who have spoken two or more languages consistently over many years experienced a delay in the onset of their symptoms by as much as five years.
“We are not claiming that bilingualism in any way prevents Alzheimer’s or other dementias, but it may contribute to cognitive reserve in the brain which appears to delay the onset of Alzheimer’s symptoms for quite some time,” said Dr. Craik, lead investigator and co-editor of The Oxford Handbook of Memory.
The brains of people who speak two languages still show deterioration from Alzheimer’s pathology; however, their special ability with two languages seems to equip them with compensatory skills to hold back the tell-tale symptoms of Alzheimer’s, such as memory loss, confusion, and difficulties with problem-solving and planning.
Observations were made on patients diagnosed with probable Alzheimer’s from 2007 to 2009. The patients’ date of diagnosis and age of onset of cognitive impairment were recorded along with information on occupational history, education and language history (i.e. fluency in English and any other languages).
The researchers found that bilingual patients had been diagnosed with Alzheimer’s 4.3 years later and had reported the onset of symptoms five years later than the monolingual patients. The groups were equivalent on measures of cognitive and occupational level, there was no apparent effect of immigration status, and there were no gender differences.
According to the American Association for Long-Term Care Insurance, the current study adds to mounting scientific evidence that lifestyle factors – such as regular cardiovascular exercise, a healthy diet, and speaking more than one language – can play a central role in how the brain copes with age-related cognitive decline and diseases such as Alzheimer’s.
The study was supported by the Canadian Institutes of Health Research and the Alzheimer’s Society of Canada.
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