<<Free Radicals

Causes: Environment

    There is no doubt that the common fatal cancers mainly occur as a result of lifestyle and other environmental factors, and is in principle, preventable. The evidence that much of human cancer is avoidable an be summarized as follow:

. Differences in the incidence of various types of cancer among different    settled communities.

. Differences bacteria migrants from a community and those who remained behind.

. Actual identification of many specific causes or preventive factors

(i) Physical agents (X-rays & UV light)

(ii) Chemical agents

(iii) Infectious agents (bacteria, fungi, parasitic animals, nurses)

    The environment is implicated in carcinogenesis, as the vast majority of tumours are carcinomas arising from epithelium in direct contact with the environment. The gut is simply an invagination of the exterior body surface and it has intimate contact with a very wick variety of chemicals in the shape of food, drink, and all other ingested material; the lungs too are an interface bet gaseous and airborne moieties and the body. However, some habits and situations more than order expose people to events able to initate carcinogenesis; the most notable of these are diet, industrial and environmental exposure to chemicals and radiation. Light may be thrown on the situation when there are large movements of population, for example, from an area of low susceptibility to a particular type of cancer to an are of high incidence of that form of the disease.