There is a growing body of evidence that suggests diet may be related to prostate cancer. A diet that is low in fat may help to prevent the growth of prostate cancer. Research has shown that tumours grown in the laboratory grow faster when the amount of fat in the diet was 40.5%, and grew more slowly with a 21% fat content. The average North American diet contains 40% fat. This is significantly higher than Asian countries, and consistent with tumour growth in laboratory studies.
Researchers have known for years that the incidence of prostate cancer is considerably lower in Asian countries. One possible explanation advanced by scientists is the high consumption of plant foods among Asian populations. Another is the growing number of laboratory studies indicating that green tea — the most popular tea in China, Japan and other Asian countries — has anti-tumor effects.