The belief that eating fiber prevents cancer is a common misconception, and the actual relationship between diet and cancer is still being studied to determine which specific components of the diet contribute to the disease.
Decades of research have been conducted on the effects of various vitamins on cancer prevention, but all supplements, including Vitamin A, B, C, D, E, Folic acid, Selenium and Omega-3 fatty acids, were found to be ineffective. Obesity has been identified as a significant factor in cancer incidence instead.
Obesity is now known to be a major risk factor for several types of cancer, including breast cancer and colorectal cancer, according to studies conducted since 2003. While not everyone who is obese will develop cancer, the risk is greatly increased.
Cancer is like a seed, and genetics play a role in its development, but it is the soil, or lifestyle, that can greatly affect its development. There has been too much emphasis on genetics as the primary cause of cancer rather than addressing lifestyle factors.