Some vitamins in plant foods are known to be inhibitors. Dietary fat, on the other hand, is known to be a promoter that helps the abnormal cells grow quickly. In 1970, British physician, Dennis Burkitt, observed that a high-fiber diet reduces diseases of the digestive tract. Around the world, this has proven true. The highest fiber intakes are found in non-industrialized nations where meat is scarce and plant foods fill the menu.
Animal products contain no fiber.
The U.S. and other Western nations whose diets are based upon animal products have the highest rates of colon cancer. While no one is certain exactly how fiber protects against digestive tract disorders, there are several possibilities. By definition, fiber cannot be digested by humans early in the digestive process. It moves food more quickly through the intestines, helping to eliminate carcinogens. It also draws water into the digestive tract.