The diet messages are everywhere: the National Cancer Institute has an "Eat 5 to 9 a Day for Better Health" program, the numbers referring to servings of fruits and vegetables, and the Prostate Cancer Foundation has a detailed anticancer diet.
Yet despite the often adamant advice, scientists say they really do not know whether dietary changes will make a difference. And there lies a quandary for today's medicine. It is turning out to be much more difficult than anyone expected to discover if diet affects cancer risk. Hypotheses abound, but convincing evidence remains elusive.
Most of the proposed dietary changes are unlikely to be harmful - less meat, more fish, more fruits and vegetables and less fat. And these changes in diet may help protect against heart disease, even if they have no effect on cancer.
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Most people want some sort of control, a way to prevent the disease from ever striking them or, if it does strike, to keep it from recurring.
Thursday, September 29
Correlation is not causation II
Which of These Foods Will Stop Cancer? (Not So Fast) By GINA KOLATA
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