Cancer has become a major health issue around the world and we have failed to find a proper solution for cancers yet.So the only thing we can do is to prevent cancers.First of all lets see what is a cancer. What is a cancer? A cancer is an abnormal growth of cells and it is generally thought to develop in 2 major steps,The first triggered by an initiator and the second caused by exposure to a tumor promoter over a period of years. In Japan the incidence of stomach cancer is very high,while that of bowel cancer is low.But when Japanese emigrates to Hawaii this is reversed,the rate of stomach caner is reduced in the next generation. Women living in the United states have a higher rate of breasts cancers than those in Asia. All these maybe related to nutrition.