• Researchers found the job with the highest cognitive demands was teaching
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Work stress isn't as bad for our brains as we've been led to believe.

According to a new analysis, a mentally challenging job could slash your chances of developing dementia.

The harder your brain works at your job, the less likely you may be to have memory and thinking problems in later life, the study suggests.

The findings counter the claims of some who blame much of America's health crises to over-working - including those in support of the four-day workweek initiative, launched by Senator Bernie Sanders .

But the new research suggest that jobs which are mentally stimulating but avoid repetition – such as teaching, working in public relations or being a computer programmer – are beneficial.

Meanwhile road workers and cleaners might be at a higher risk.

As part of the study, a team from Oslo University Hospital in Norway analysed 7,000 people across 305 different occupations.

They measured the amount of cognitive stimulation that participants experienced while at work, and divided them into four groups based on their results.

They also measured the degree of routine manual tasks carried out, for example repetitive motions during factory work, and the degree of repetitive cognitive tasks such as bookkeeping and filing.

Then, they recorded the degree of non-repetitive analytical tasks such as engaging in creative thinking, the degree of non-routine interpersonal tasks such as coaching, and the degree of non-repetitive cognitive tasks involved in careers such as public relations and computer programming.

After the age of 70, participants completed memory and thinking tests to assess whether they had mild cognitive impairment.

Analysis revealed that of those who had jobs with the lowest cognitive demands, 42 per cent were diagnosed with mild cognitive impairment.

Of those who had jobs with the highest cognitive demands, 27 per cent were diagnosed with mild cognitive impairment.

Overall, the group with the lowest cognitive demands at work had a 66 per cent higher risk of mild cognitive impairment compared to the group with the highest cognitive demands.

Author Trine Edwin said: ‘We examined the demands of various jobs and found that cognitive stimulation at work during different stages in life — during your 30s, 40s, 50s and 60s — was linked to a reduced risk of mild cognitive impairment after the age of 70.

‘Our findings highlight the value of having a job that requires more complex thinking as a way to possibly maintain memory and thinking in old age.’

The findings were published in the journal Neurology.