People who work more than 53 hours a week are TWICE as likely to develop an underactive thyroid as people doing a standard 9-5, scientists discover

  • Korean employees who worked longer more likely to have an underactive thyroid
  • Hormones produced by thyroid control heart function, digestion, metabolism
  • Overwork threatens the health and safety of workers worldwide, scientist says 

Workaholics are more likely to have an underactive thyroid, known as hypothyroidism, according to a new study.

Hypothyroidism was twice as common in people working more than 53 hours a week, compared with those working 36 to 42 hours a week — the equivalent of a full-time 9-5 profession. 

An underactive thyroid has been linked to several health concerns, including heart disease and diabetes.

Hormones produced by the thyroid are crucial in controlling heart function, digestion muscle control, brain development and bone maintenance. 

The researchers are unsure what it is about long working hours that could lead to the condition and hope further research can shed light on the correlation.  

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The thyroid gland is an endocrine gland in your neck and it produces many hormones that have a range of functions. An underactive thyroid has been linked to several health concerns, including heart disease and diabetes (stock photo)

The thyroid gland is an endocrine gland in your neck and it produces many hormones that have a range of functions. An underactive thyroid has been linked to several health concerns, including heart disease and diabetes (stock photo)

‘Overwork is a prevalent problem threatening the health and safety of workers worldwide,’ said principal investigator Young Ki Lee at the National Cancer Center in Goyang-si, South Korea.

‘To our knowledge, this study is the first to show that long working hours are associated with hypothyroidism.’

Researchers found a higher risk of hypothyroidism in people who worked long hours regardless of their socioeconomic status or sex.

WHAT IS AN UNDER-ACTIVE THYROID?

Hypothyroidism (underactive thyroid) is a condition in which your thyroid gland doesn’t produce enough of certain crucial hormones.

Over time, untreated hypothyroidism can cause a number of health problems, such as obesity, joint pain, infertility and heart disease.

Early symptoms of hypothyroidism can be fatigue and weight gain.

But as the metabolism continues to slow, patients may develop more-obvious problems. 

These can include constipation, dry skin, weight gain, puffy face, muscle weakness, elevated blood cholesterol level, and pain, stiffness or swelling in joints. 

Most cases of an underactive thyroid are caused by the immune system attacking the thyroid gland and damaging it, or by damage that occurs as a result of treatments for thyroid cancer or an overactive thyroid. 

The thyroid gland is an endocrine gland in your neck that makes two hormones that are secreted into the blood – thyroxine (T4) and triiodothyronine (T3) 

This is despite the fact that the disorder affects more women than men.

The study results – published in Journal of the Endocrine Society – were due to be published at the Endocrine Society’s annual ENDO meeting in San Francisco this week, which was cancelled due to COVID-19.

The researchers used the data of 2,160 adult full time workers who participated in the Korea National Health and Nutrition Examination Survey from 2013 to 2015.

Hypothyroidism occurred in 3.5 per cent of subjects who worked 53 to 83 hours a week compared with 1.4 per cent of those who worked 36 to 42 weekly hours.

A working week of between 53 to 83 hours equates to somewhere between 10.5 and 16.5 hours of work a day, if working five days a week.

Further studies are now needed to find out whether long working hours cause hypothyroidism, which is a known risk factor for heart disease and diabetes, the team said.

‘If a causal relationship is established it can be the basis for recommending a reduction in working hours to improve thyroid function among overworked individuals with hypothyroidism,’ said Professor Lee.

‘Additionally, screening for hypothyroidism could be easily integrated into workers’ health screening programs using simple laboratory tests.’

Hypothyroidism occurred in 3.5 per cent of subjects who worked 53 to 83 hours a week compared with 1.4 per cent of those who worked 36 to 42 weekly hours (stock photo)

Hypothyroidism occurred in 3.5 per cent of subjects who worked 53 to 83 hours a week compared with 1.4 per cent of those who worked 36 to 42 weekly hours (stock photo)

Because South Korea passed a law in 2018 that reduced the maximum number of working hours from 68 to 52 per week, a fall in hypothyroidism cases could be an important indicator in future studies. 

‘If long working hours really cause hypothyroidism, the prevalence of hypothyroidism in Korea might decrease slightly as the working hours decrease,’ Lee said.

In the UK, employees can’t work more than 48 hours a week on average, with some exceptions based on industry.

However, employees can choose to opt-out of the rule and choose to work more than 48 hours a week.

About 2 per cent of the UK population have hypothyroidism, which is about 10 times more common in women, according to the British Journal of General Practice.





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