Working longer hours is associated with a higher risk of obesity, according to international research presented at the European Congress on Obesity in Istanbul. The study analysed working patterns and obesity prevalence across 33 OECD countries from 1990 to 2022, finding that nations with longer annual working hours—such as the US, Mexico, and Colombia—also had higher obesity rates, despite northern European countries consuming more energy and fat on average.
Researchers calculated that reducing annual working hours by just 1% was linked to a 0.16% decrease in obesity rates. Lead author Dr Pradeepa Korale-Gedara of the University of Queensland suggested that lack of time for exercise and work-related stress could explain the connection, noting that increased stress raises cortisol levels, causing the body to store more fat, while many jobs do not allow for energy expenditure.
The findings have prompted renewed calls for a four-day working week in the UK. James Reeves, campaign manager at the 4 Day Week Foundation, argued that a shorter week could help millions make healthier choices: 'A four-day week on full pay could slash Britain’s obesity levels by giving millions the time they need to ditch bad habits.' Dr Rita Fontinha, a psychologist at the University of Reading, added that long hours lead to 'time poverty', making it harder to cook nutritious meals and exercise.
Around 200 UK companies have already adopted a four-day week, and South Cambridgeshire district council introduced it for all staff. However, the government has ruled out mandating the policy. A government spokesperson said: 'This government will not mandate a four-day work week for five days’ pay. But through the Employment Rights Act, we’re making it easier for flexible working requests to be accepted.'
