Human cancer risk is strongly infleunced by life style choices, including diet;
differences in diet contribute to international variations in cancer incidence. Dietary
patterns in Japan are growing closer to those in the United States and most likely are
contributing to the rising rates of colorectal, breast, and prostate cancers in Japan.
However, Korean general population is still high mortality due to stomach and liver
cancer despite of the Westernized dietary habits. Diet and cancer studies show that,
generally, vegetables and fruits, dietary fiber, and certain nutrients seem to be protective
against cancer, whereas fat, excessive calories, and alcohol seem to increase cancer
rsik. Many dietary epidemiologic studies have helped to identify many dietary factors
as naturally occurring chemopreventive agents. We hope that the nutritional guidances
by the knowledges of the cancer prevention may reduce the risk for cancer.
Considerable evidence links dietary factors with human cancer risk, but ongoing
investigation is needed. The ethical issues associated with clinical cancer prevention
research are multiple and varied, and additional works is required to accrue relevant
data and to more clearly define the ethical issues raised by this type of research.

Keywords: Dietary Factors, Cancer Prevention, Cancer Epidemiology, Functional
Foods