a close up of a man: People with high strain jobs – judged as those in which they do not have much decision-making power and there are conflicting demands – are more likely to develop depression in their middle age© Provided by Associated Newspapers Limited People with high strain jobs – judged as those in which they do not have much decision-making power and there are conflicting demands – are more likely to develop depression in their middle age People in high-stress jobs have a greater chance of suffering from depression or anxiety by the time they reach middle age, a study has found.

A 60-year analysis of nearly 7,000 British adults found those with highly demanding careers, low job control and a high level of strain at work are at higher risk of mental illness.

The data looked at whether people's job strain at age 45 affected their risk of developing a common mental disorder – such as depression or anxiety – by age 50.

When compared with a control group, those with high job demands were 70 percent more likely to develop mental health issues, and people with low job control were 89 percent more likely.

People whose job was classed as 'high strain' faced more than double the risk of developing mental illness in their middle age.

The researchers suggest that it is important for employers to try to improve working environments to reduce rates of mental illness.

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But they were unsuccessful in their attempts and Charlie died last July, a week before his first birthday.

He had suffered from a rare genetic condition called mitochondrial depletion syndrome, which causes progressive muscle weakness and brain damage.

Mr Gard said that before his son's death he had promised the child he would "care for and look after" the youngster's mother.

He wrote on Facebook: "Just a couple of hours before Charlie passed away, I laid on his bed, held his hand and had a little father/son chat with him.

"I told him many things. I told him how much he was loved, how much he would be missed and how proud we all were of him, amongst lots of other things.

"I also made a number of promises to him. Ones that I will never break. And one of those promises I made was that no matter what happens, I would always care for and look after his gorgeous mummy for him.