Does Exercising More Prevent Cancer? Why You Should Wiggle Your Hips at Work Without Worrying About Your Boss [Reading Science]

Sitting One Hour Longer Each Day Raises Cancer Mortality Risk by 9%
UK Study Tracks 90,000 People Over 12 Years: "How You Sit Matters More Than How Long You Sit"
Even Light Movement Reduces Risk: "Exercise Alone Is Not Enough"

A study has found that for every additional hour spent sitting for long periods in a day, the risk of dying from cancer increases by 9%. Notably, the habit of sitting continuously for more than 30 minutes at a time, rather than simply the total amount of time spent sitting, was shown to elevate both the risk of developing cancer and cancer-related mortality.

The research team from the University of Glasgow announced on July 3 in the international journal PLOS Medicine that they tracked 91,292 participants from the UK Biobank for an average of more than 12 years.

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The researchers asked participants to wear activity monitors for seven days and analyzed their sedentary behavior by dividing it into two categories: long-term sedentary behavior, defined as sitting continuously with minimal movement for more than 30 minutes, and intermittent sedentary behavior, where sitting was frequently interrupted by movement.

The analysis revealed that for every additional hour spent sitting continuously in a day, the risk of cancer mortality increased by 9%. The overall risk of developing cancer also rose, with the risk of obesity-related cancers such as esophageal, liver, kidney, pancreatic, colon, breast, ovarian, and thyroid cancers, as well as cancers associated with type 2 diabetes, also increasing.

On the other hand, replacing prolonged sitting with light physical activity reduced the risk of cancer mortality by 12%. Intermittent sedentary behavior, where individuals frequently got up and moved around, was found in most analyses to lower both cancer incidence and mortality risks.

'How You Sit' Matters More Than 'How Long You Sit'

The research team explained that simply breaking up long periods of sitting with short bouts of movement can improve metabolic responses. While current health guidelines focus on moderate to high-intensity activities such as walking or running, this study highlights that even light daily movement plays an important role in health management.

Lee Sang-Yeol, Professor of Endocrinology and Metabolism and Director of the Digital Health Center at Kyung Hee University School of Medicine, stated, "The significance of this study lies in confirming, using large-scale long-term data from over 90,000 individuals, the difference between sitting continuously and frequently interrupting sitting time."

However, he explained, "The 9% increase in cancer mortality risk per additional hour per day refers to a relative risk increase, with the absolute risk increase being much smaller." He added, "As this is an observational study, causality cannot be definitively established, and residual confounding factors—such as the possibility that healthier individuals tend to move more frequently—must also be considered."

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Nabil Djouder, head of the Growth Factors, Nutrients and Cancer Group at the Spanish National Cancer Research Center (CNIO), commented, "By analyzing a cohort of over 90,000 participants for more than 12 years and using activity monitors for objective measurement, this study offers greater reliability than previous research." He added, "Importantly, the study advanced beyond simply measuring how long participants sat to analyze how their sitting time was accumulated throughout the day."

He continued, "While, as an observational study, this cannot be taken as direct evidence that prolonged sitting causes cancer, it clearly demonstrates that frequently interrupting long periods of sitting and replacing them with light activity could become an important lifestyle habit for cancer prevention. We must move away from the belief that exercise alone can offset all the risks of a sedentary lifestyle."

The research team emphasized, "Simply reducing long periods of sitting and making a habit of standing up and moving lightly at intervals can meaningfully benefit your health. Reducing sedentary time and regular exercise are not alternatives to each other, but rather complementary strategies that should be pursued together for better health."

This content was produced with the assistance of AI translation services.