5 key reasons colon cancer is rising among young people; and ways to prevent
Surprisingly, many of those affected have no family history or visible health issues.
A recent study has begun shedding light on why this silent shift is occurring, and the causes go far beyond genetics. From gut bacteria to lifestyle habits, several interconnected factors are raising red flags. Understanding these causes is essential to help prevent, screen for, and catch colon cancer earlier in young populations.
Why more young adults are getting colon cancer: Lifestyle and gut health factors
Health researchers have identified a dramatic increase in colon and rectal cancer cases in individuals in their 20s, 30s, and 40s. The US alone has seen a two-fold increase in cases under age 55 in just the past two decades. Colon cancer has become the leading cause of cancer death in men under 50 and the second most common in young women. The traditional belief that only age and heredity are to blame is now outdated, as most of these cases are not genetically driven.
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Key factors contributing to colon cancer
1. Unhealthy diets and obesity
Modern diets, especially in urban and Westernized societies, are filled with ultra-processed foods, red meat, sugar, and unhealthy fats, while being low in fiber. These eating habits are now directly linked to increased colon cancer risk. In addition, obesity and diabetes are becoming more common in young adults and play a significant role in increasing inflammation and cancer risk in the colon.
2. Gut microbiome & bacterial toxins
A new study identified a gut bacterial toxin called colibactin, produced by some strains of E.
coli, which damages DNA and may trigger colon cancer. Younger patients were far more likely to carry these colibactin-induced mutations, especially if they were exposed in childhood. Gut imbalance caused by poor diet, antibiotic overuse, or pollution may further worsen the risk.
3. Environmental exposures
Microplastics, endocrine disruptors, air pollution, and other environmental chemicals may contribute to rising cancer rates by disrupting hormonal and metabolic processes.
These generational exposures can damage gut health early in life.
4. Sedentary lifestyle
Young people today are spending more time sitting, whether due to work, screen time, or lack of outdoor activity. This inactivity, combined with poor diet, raises the risk of chronic diseases, including cancer.
5. Low screening rates and late diagnosis
Until recently, colon cancer screening typically began at age 50. As a result, many young adults are diagnosed late, after the disease has advanced. Symptoms such as rectal bleeding, unexplained fatigue, or persistent changes in bowel habits are often ignored or misdiagnosed in younger people.
Precautionary tips to lower risk early
Start screening earlier: If you're over 45, get screened for colorectal cancer, even sooner if you have symptoms or family history.
Eat a fiber-rich, whole-food diet: Include fruits, vegetables, whole grains, and legumes in your daily meals. Reduce intake of red meat, sugar, and ultra-processed foods.
Support a healthy gut microbiome: Include probiotic and prebiotic-rich foods like yogurt, kefir, bananas, garlic, and oats. Limit unnecessary antibiotic use.
Stay physically active: Exercise at least 30 minutes a day to keep your metabolism healthy and inflammation in check.
Know the warning signs: Don't ignore early symptoms like blood in stool, abdominal pain, or long-term changes in bowel movements.
Avoid smoking and limit alcohol: Both are known contributors to colorectal and other forms of cancer, even in younger people.
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