Early-Onset Colorectal Cancer Surges in Young Adults: Lifestyle, Diet, Obesity Risks

• Colorectal cancer is increasingly diagnosed in individuals younger than 50, a shift from its historical prevalence in older adults.
• Rising consumption of ultra-processed foods is a key driver, significantly increasing the risk of early adenomatous polyps.
• Obesity and sedentary behavior create a permissive environment for tumor development, characterized by chronic low-grade inflammation.
• Depletion of dietary fiber in modern diets disrupts protective microbiome-mediated pathways, accelerating adenoma formation.
• Early-onset colorectal cancer is multifactorial, involving metabolic inflammation, microbiome alteration, and lifestyle behaviors.