Aspirin packs powerful punch against colorectal cancer for overweight or unhealthy people

For years, doctors have touted the potential benefits of taking a daily aspirin to reduce the risk of colorectal cancer. Now, a new study suggests that this simple over-the-counter medication may pack an even bigger punch for those who need it most – people with less-than-healthy lifestyles.

Researchers from Harvard Medical School and Massachusetts General Hospital have found that while regular aspirin use can lower colorectal cancer risk for most people, the protective effect is significantly more pronounced in individuals with unhealthy habits like smoking, being overweight, or not exercising regularly.

This discovery could help doctors better target cancer prevention efforts and provide new motivation for those struggling to adopt healthier behaviors.

“Our results show that aspirin can proportionally lower the markedly elevated risk in those with multiple risk factors for colorectal cancer,” said Dr. Daniel Sikavi, lead author of the paper and a gastroenterologist at MGH. “In contrast, those with a healthier lifestyle have a lower baseline risk of colorectal cancer, and, therefore, their benefit from aspirin was still evident, albeit less pronounced.”

The study, published in JAMA Oncology, followed over 100,000 health professionals for more than three decades, tracking their aspirin use, lifestyle habits, and rates of colorectal cancer. The results were eye-opening: While aspirin use was associated with a lower cancer risk across the board, the magnitude of that benefit varied dramatically based on how healthy a person’s overall lifestyle was.

For those with the unhealthiest lifestyles – characterized by factors like obesity, smoking, heavy drinking, lack of exercise, and poor diet – regular aspirin use was linked to a whopping 1.28% reduction in the absolute risk of developing colorectal cancer over 10 years. To put that in perspective, it means that for every 78 people with very unhealthy lifestyles who took aspirin regularly, one case of colorectal cancer was prevented.

In contrast, among those with the healthiest lifestyles, the benefit was much more modest – just a 0.11% reduction in absolute risk. In other words, 909 people with very healthy lifestyles would need to take aspirin regularly to prevent one case of colorectal cancer.

Of course, these findings don’t mean that people with healthy lifestyles shouldn’t take aspirin. Rather, the authors suggest that aspirin may be an especially powerful tool for cancer prevention in those who are at higher risk due to unhealthy behaviors.

The study’s results highlight the importance of considering both medication and lifestyle factors in cancer prevention strategies. While adopting healthy habits like maintaining a normal weight, not smoking, exercising regularly, and eating a balanced diet remains crucial for reducing cancer risk, aspirin may offer an additional layer of protection – especially for those who struggle to make these lifestyle changes.

Interestingly, the researchers found that body mass index (BMI) and smoking status had the biggest impact on how much benefit people got from aspirin use. This suggests that overweight individuals and smokers might have the most to gain from adding a daily aspirin to their health regimen, though of course quitting smoking and losing weight should still be primary goals.

It’s important to note that while these findings are promising, they also don’t mean everyone should start taking aspirin immediately. The medication can have side effects, including an increased risk of bleeding, so it’s crucial to consult with a healthcare provider before starting any new medication regimen.

Moreover, the study’s authors emphasize that aspirin is not a substitute for a healthy lifestyle. Even among those taking aspirin regularly, people with healthier habits still had a lower overall risk of colorectal cancer than those with unhealthy lifestyles.

Whether you’re a health nut or someone who’s still working on kicking that smoking habit, this study underscores an important message: When it comes to preventing colorectal cancer, every positive step counts – and for some, a daily aspirin might be a particularly powerful weapon in that fight.