Many people experience periods when work dominates daily life. Exercise routines get disrupted, meals become rushed or unhealthy, and sleep schedules suffer. Now, a growing body of research suggests that excessive working hours may do more than cause exhaustion — they could also contribute significantly to rising obesity rates.
A recent study presented at the European Congress on Obesity in Istanbul found that a one per cent reduction in annual working hours was associated with a 0.16 per cent decline in obesity rates across OECD countries.
Although the reduction may appear small, researchers believe it highlights how work patterns can directly influence public health, alongside factors such as diet and physical activity.
Large Global Studies Show Increased Obesity Risk
In addition, researchers analysed data from 19 cohort studies conducted across Europe, the United States, and Australia involving more than 122,000 participants monitored over an average period of 4.4 years.
As reported by TOI, the findings revealed that individuals working more than 55 hours per week faced a 17 per cent higher risk of becoming overweight or obese compared to those working standard 35–40 hour weeks.
These results suggest that long working hours may have a measurable impact on body weight and metabolic health.
Stress, Poor Diet and Lack of Sleep Drive Weight Gain
Researchers explained that long working hours often reduce the time available for exercise, healthy meal preparation, and adequate sleep.
As a result, many people rely on fast food or processed meals due to busy schedules and fatigue. Furthermore, chronic workplace stress can increase cortisol levels, which may trigger cravings for calorie-dense comfort foods.
At the same time, insufficient sleep can disrupt metabolism, reduce energy levels, and impair impulse control, making it harder to maintain healthy habits.
Consequently, prolonged work-related stress and lifestyle disruption may create conditions that promote gradual weight gain.
Sedentary Jobs Increase Health Risks
The Australian study, which analysed data from 33 OECD countries over more than three decades, found that the impact of long working hours was particularly significant among men.
Researchers noted that sedentary occupations often involve prolonged sitting and limited physical activity. Additionally, desk-based work environments may encourage frequent snacking and greater consumption of processed, high-calorie foods.
Therefore, each additional hour spent at a desk may reduce opportunities for movement while increasing unhealthy eating behaviours.
‘Time Poverty’ Limits Healthy Lifestyle Choices
Experts also highlighted the growing concept of “time poverty,” where individuals working excessively long hours struggle to find time for healthy routines.
For many workers, unpredictable schedules and extended workdays make it difficult to exercise regularly, prepare nutritious meals, or maintain consistent sleep patterns.
Moreover, fatigue caused by overwork can further reduce motivation for physical activity and healthy decision-making, creating a cycle that becomes increasingly difficult to break.
Researchers emphasised that obesity should not be viewed solely as an issue of personal discipline or lifestyle choices, as work structures and occupational pressures also play a major role.
Older Workers Face Greater Challenges
The studies further showed that older employees working more than 59 hours per week were significantly more likely to gain weight than those working fewer hours.
Researchers explained that ageing bodies already experience metabolic changes, and excessive work-related stress may worsen these effects.
Consequently, long working hours may place older adults at even greater risk of obesity and related health complications.
Researchers Call for Broader Workplace Reforms
Importantly, the research is shifting conversations about obesity beyond individual responsibility toward broader structural and workplace factors.
Some companies in the United Kingdom have already started experimenting with four-day work weeks. Early findings suggest that employees experience lower stress levels and improved work-life balance.
Although researchers are still evaluating whether such changes directly reduce obesity rates, they believe workplace policies could become an important tool in improving long-term public health.
Ultimately, the studies suggest that rising obesity rates may reflect not only dietary and lifestyle habits but also the increasing demands and pressures of modern work culture.