Cancer and Nutrition: Be Cautious When Making Dietary Recommendations
While a number of major dietary components--including fat, total energy, salt, red meat and alcohol--have been implicated as contributing to specific cancers, current case-control and cohort studies do not support some of the predominant hypotheses that are influencing Canadian eating habits. A major reason for the current level of certainty is the challenges inherent in nutrition epidemiology.
Diets are extremely complex. Nutrients are found in a multitude of foods, and their absorption and activity is influenced by other dietary components eaten at the same time. People change their eating habits over time and we have no idea as to the relevant latency period for various diet-related effects.
"The only clear recommendation we can make at this time is to eat more fresh fruits and vegetables.