Final answer:
Dietary fiber deficiency can lead to an increased risk of colorectal carcinoma. Fiber-rich diets decrease the risk by diluting the concentration of carcinogens and hastening their removal from the body. Reducing processed meat and refined carb intake is also recommended.
Step-by-step explanation:
A dietary deficiency that can lead to colorectal carcinoma is a lack of dietary fiber. A diet high in animal fats and protein, without sufficient fiber, can increase one's risk of developing this type of cancer.
Fiber acts as an anti-carcinogen by speeding up the expulsion of bile acids and reducing the concentration of carcinogens in the colon by increasing the rate of passage through the gastrointestinal tract. Conversely, diets rich in processed meats with additives like nitrites may further increase the risk of colorectal cancer.
The American Institute for Cancer Research and similar organizations recommend eating more fruits, vegetables, and whole grains, all good sources of fiber, to decrease cancer risk. Additionally, reducing the intake of processed meats and refined carbohydrates is advised to maintain overall health and lower the risk of colorectal cancer.