A condition affecting about one in four Americans could increase the likelihood of a rapid rise in cancer among younger individuals, according to a study.
Research has indicated a connection between early-stage colon cancer and fatty liver disease, characterized by excessive fat build-up in the liver.
This condition, impacting 80 to 100 million Americans, often progresses quietly, showing few or no symptoms. Yet, it can trigger inflammation in the body that’s linked to cancer.
The most prevalent form is associated with alcohol consumption, but non-alcoholic liver disease can also arise from sugary diets, obesity, and smoking.
The findings showed that individuals under the age of 50 with a history of non-alcoholic fatty liver disease (NAFLD) were as much as 24 percent more likely to develop colon cancer compared to those without the condition.
Moreover, early indicators of the disease were linked to a 12 percent higher risk than those with no liver issues.
The researchers proposed that the inflammation associated with NAFLD could potentially affect the colon, damaging DNA in cells and resulting in cancer growth.
The team from South Korea noted that while further studies are necessary, people with NAFLD might benefit from early screenings for colon cancer.
In a study involving nearly 5 million adults aged 20 to 49, it was found that men with NAFLD were 17 percent more likely than women to face colorectal cancer.
This discrepancy has been linked to men’s higher tendencies to smoke and be obese, both of which are risk factors for liver disease.
The researchers articulated their findings, emphasizing a notable relationship between NAFLD and early-onset colorectal cancer, which indicates a pressing need for effective preventive measures, especially among populations experiencing increasing metabolic dysfunction.
The research emerges amid a troubling rise in colorectal cancer among younger Americans, with cases in those under 50 escalating from 8.6 per 100,000 to 13 per 100,000 over the past twenty years.
Published in the journal Clinical Gastroenterology and Hepatology, the study utilized data from a South Korean insurance database, analyzing 4.6 million adults in the specified age group.
Out of this group, 2,733 were diagnosed with early-onset colorectal cancer after an average follow-up period of nine years.
Participants were grouped based on their NAFLD status—those with NAFLD, borderline NAFLD, or no liver disease. Diagnosis of fatty liver typically involves physical examinations, blood tests, and imaging techniques such as ultrasound, CT scans, or MRIs.
Approximately 11 percent were diagnosed with NAFLD, 19 percent were classified as borderline, and 70 percent exhibited no history of the disease. Individuals in the NAFLD category were generally older, male, smokers, and moderate drinkers.
They also displayed higher BMI, waist size, and blood pressure—all common risk factors for liver disease.
After adjusting for various risk factors, it was evident that NAFLD patients faced a 24 percent increased risk of developing early colon cancer, with those in the borderline group holding a 12 percent higher risk compared to individuals without NAFLD.
Interestingly, males were 17 percent more likely than females to contract colorectal cancer if they had NAFLD.
The gender gap could be attributed to men often leading unhealthier lifestyles, while the female hormone estrogen may support healthy gut bacteria and mitigate inflammation.
Notably, smoking, which is a common risk for NAFLD, is more prevalent among men, whereas women typically consume more anti-inflammatory fruits and vegetables.
Younger NAFLD patients in their 20s were observed to have a 24 percent increased risk of colon cancer relative to those in their 30s and 11 percent higher than those in their 40s.
The risk was also found to be 18 percent greater for non-diabetics when compared to diabetics, prompting experts to suggest that NAFLD may serve as a more reliable indicator of colon cancer risk than diabetes.
The researchers stated that, to the best of their knowledge, their study is the first to present clinical evidence highlighting the relationship between NAFLD and early-onset colorectal cancer.
The team proposed a potential linkage between NAFLD and early colorectal cancer through interconnected inflammatory pathways.
NAFLD generates inflammation that harms cell DNA, amplifying the chances of cancerous growth. Chronic inflammation in the liver releases cytokines—proteins that interact with the immune system—which promote cancer cell proliferation.
Furthermore, it disrupts bile acid function, resulting in an imbalance in the gut microbiome, which is a recognized risk factor for colorectal cancer.
The condition notably increases the risk for tumors in the lower left side of the colon and the rectum, although the underlying mechanisms remain unclear.
There were limitations to this study, including a lack of data on family histories, cancer stages, and colonoscopy records.
The researchers emphasized the importance of adopting comprehensive preventive strategies, including lifestyle changes and expanded screening, especially for younger individuals diagnosed with NAFLD.
