A nurse is teaching a health class about colorectal cancer. Which information is incorrect and should not be included in the teaching session?

Choice A reason: High intake of animal fats or red meat is a recognized risk factor for colorectal cancer. These foods, high in saturated fats, may promote inflammation and alter gut microbiota, increasing carcinogenesis risk in the colon, supported by epidemiological studies linking diet to cancer. Choice B reason: Rectal bleeding is a warning sign of colorectal cancer. It results from tumor erosion or ulceration in the colon or rectum, causing blood in stool. This symptom prompts diagnostic evaluation, like colonoscopy, to detect malignancy early, improving treatment outcomes. Choice C reason: Smoking is a risk factor for colorectal cancer. Tobacco’s carcinogenic compounds, like polycyclic aromatic hydrocarbons, damage colonic mucosa, increasing mutation risk. Smoking also promotes inflammation, contributing to tumor development, making it a significant modifiable risk factor in colorectal cancer prevention. Choice D reason: Diarrhea is not a specific warning sign of colorectal cancer. While it may occur, it’s more commonly associated with infections or irritable bowel syndrome. Cancer typically presents with persistent bleeding, weight loss, or bowel habit changes, making diarrhea less diagnostic and misleading for teaching.