Lifestyle factors, including diet, physical activity, and smoking, can act as external stimuli that influence cancer risk. A diet high in processed foods, red meat, and low in fruits and vegetables has been linked to an increased risk of colorectal cancer. Lack of physical activity is associated with a higher risk of several types of cancer, including breast and colon cancer. Smoking is one of the most significant lifestyle factors, contributing to a variety of cancers, especially lung cancer.
