Fifteen Minutes of Exercise May Lower Cancer Risk When It Replaces Sleeping or Sedentary Time

A recent study, published in the journal BMC Medicine, suggests that even short bursts of exercise may help lower the risk of cancer. Researchers tracked the health data of nearly 60,000 individuals and found that replacing sedentary time or sleep with physical activity can reduce the likelihood of developing cancer. According to lead author John Mitchell, a senior research fellow in physical activity epidemiology at University College London, simply swapping two to three minutes of sitting, sleeping, or light activity with vigorous exercise, such as running for a bus, could increase cancer risk.

The study emphasizes the importance of the 24-hour daily movement spectrum, which incorporates sleep, sedentary behavior, and physical activity. Researchers discovered that replacing 15 minutes of sleep or sedentary behavior with 15 minutes of movement led to a 2 percent reduced risk of cancer. In contrast, swapping 30 minutes of movement for sedentary behavior increased cancer risk by 8 percent, while replacing movement with sleep raised the risk by 7 percent.

Vigorous physical activity, such as brisk walking or jogging, provided the greatest reduction in cancer risk, with just three minutes of vigorous exercise potentially lowering risk. The research highlights the importance of maintaining an active lifestyle to mitigate cancer risk, even if it cannot guarantee a cancer-free future.