As awareness grows about the increasing prevalence of colorectal cancer among younger women, new research is shedding light on a possible dietary culprit lurking in the kitchens and grocery carts across America. A recent study published in JAMA Oncology has uncovered a significant association between high consumption of ultra-processed foods and the presence of precancerous colorectal polyps in women under the age of 50—a finding that could help explain the alarming rise in early-onset colorectal cancer.
Ultra-processed foods, which dominate approximately 70% of the U.S. food supply, are widely consumed and often favored for their convenience and shelf life. These products typically contain a host of artificial ingredients, such as preservatives, colorings, and flavor enhancers, that extend their longevity but have questionable health impacts. Medical experts have long cautioned against regular intake of such foods due to their established links with obesity and cardiovascular ailments. Now, evidence suggests that their role in gut health may warrant renewed attention.
Y. Nancy You, MD, who directs the Young-onset Colorectal Cancer Program at the University of Texas MD Anderson Cancer Center, emphasizes that diets high in ultra-processed fare typically lack beneficial components like fiber, fresh produce, and whole grains. “Those foods are linked with good gut health,” You notes, underscoring the importance of balancing nutrition. Meanwhile, Saumya Maru, MD, PhD, at Fox Chase Cancer Center’s Institute for Cancer Research, expresses concern about the effects of additives. According to Maru, “Consuming foods that are high in multiple unhealthy components, particularly additives, might be disrupting the gut microbiome and increasing inflammation, which are factors that are believed to contribute to the development of [colorectal] cancer.” Maru further points out that the calorie-dense nature of ultra-processed foods can contribute to obesity, itself a known risk factor for early colorectal malignancies.
The investigation, led by researchers analyzing data from the expansive Nurses’ Health Study, involved over 29,000 female registered nurses under 50. Their findings pointed to a striking pattern: participants who reported eating roughly ten servings of ultra-processed food daily faced a 45% greater likelihood of developing adenomas—precancerous polyps—compared to those who consumed three or fewer servings. While the study does not establish causation, the correlation is strong enough for experts to urge caution and dietary changes.
Despite the pervasiveness of ultra-processed food in daily diets, experts advise a pragmatic approach rather than drastic measures. Jessica Cording, RD, CDN, author of “The Little Book of Game-Changers,” recognizes that occasional indulgence is unlikely to cause harm, especially given that the highest risk was seen in women consuming ten or more servings per day. Still, she encourages those aiming to improve their health to prioritize nutrient-rich, minimally processed foods. “That can help to crowd out the ultra-processed foods,” Cording suggests, offering practical guidance: fill your plate with wholesome choices—lean proteins, fruits, vegetables, and whole grains—before considering packaged items.
The complexity of colorectal cancer means that dietary adjustments alone may not eliminate risk, particularly for those with a family history or other concerns. Regular screenings and consultations with health professionals remain vital steps. As science continues to unravel connections between food and disease, moderation and mindful eating may be among the most effective tools available to the public.
