Speaking Two Languages May Affect Dementia Risk in an Unexpected Way

Key Points:

• A recent Canadian study explored how bilingualism, verbal memory, and sex hormones interact to influence cognitive resilience and dementia risk in older adults, using data from over 500 participants with mild cognitive impairment or Alzheimer's disease.
• The study found that a combined resilience index, incorporating bilingual proficiency, verbal memory, sex hormones, education, age, and immigration status, was linked to lower dementia-related pathology and better cognitive performance.
• Bilingual participants generally showed higher resilience scores, but effects varied by sex: bilingual men exhibited greater brain protection, potentially due to the interaction of testosterone conversion to estradiol and bilingual language experience.
• Women demonstrated stronger verbal memory, which is often used in dementia diagnosis, but bilingual women did not show the expected added protection, highlighting the complexity of cognitive resilience factors.
• The findings emphasize the need for further research on sex hormones' role in brain health and suggest that cognitive assessments should consider factors beyond verbal memory to improve dementia diagnosis accuracy.