Longer Work Hours Track With Higher Obesity

Long workdays may carry a hidden cost far beyond burnout: higher obesity rates across entire countries.

Research presented at the European Congress on Obesity in Istanbul compared working patterns and obesity prevalence in 33 OECD countries from 1990 to 2022, and the pattern stood out. Countries with longer annual working hours, including the US, Mexico and Colombia, also showed higher obesity rates, reports indicate. The finding adds weight to growing arguments that work schedules shape health just as much as diet and exercise do.

The study also complicates a common assumption about food alone driving obesity trends. Researchers found that northern European countries consume more energy and fat on average than countries in Latin America, yet the nations with longer working hours still recorded higher obesity levels. That does not prove long hours directly cause weight gain, but it suggests time pressure, stress and reduced room for rest or healthier routines may play a larger role than many policymakers admit.

The new data pushes the debate over working time out of the office and into public health.

That shift matters in the UK, where advocates have already pushed a four-day week as a way to improve wellbeing without sacrificing output. This research gives that campaign a fresh health argument. If less time at work helps people sleep more, cook more, move more and recover from stress, then labor policy starts to look like health policy too.

The next step will likely center on scrutiny, not consensus. Researchers and policymakers will need to test whether shorter working weeks actually reduce obesity risk at the individual level and across different sectors. But the signal already looks hard to ignore: if long hours track with poorer health outcomes, governments and employers may face growing pressure to treat working time as a public health issue, not just an economic one.