Volunteers who reported being very contented with their work, relationships and social lives were significantly less likely to develop the incurable mind-wasting disease.
The results, in the journal Geroscience, revealed those most satisfied with life had a 72 per cent lower risk of developing dementia than others unhappy with their lot.
Feeling fed up or depressed is known to trigger higher levels in the brain of the stress hormone cortisol, which has been linked to brain shrinkage, cognitive decline and Alzheimer's.
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