Weighing the Evidence
In November 2007, AICR and the World Cancer Research Fund published Food, Nutrition, Physical Activity and the Prevention of Cancer: a Global Perspective, the most comprehensive report on diet and cancer ever completed.
The Report took six years to produce, and the process was transparent, objective and comprehensive. First, the global scientific literature was searched for relevant studies. Initial searches found some half a million studies, which were soon culled to 22,000. Ultimately, over 7,000 scientific studies were deemed relevant and met the report’s rigorous criteria.
These studies were independently reviewed, compiled and presented to an Expert Panel of 21 world-renowned scientists, who judged the accumulated evidence and developed 10 Recommendations for Cancer Prevention.
The panel judges the strength of the evidence linking different aspects of diet, physical activity and body weight to risk of specific cancer types.
strong, consistent and unlikely to change in the future
compelling but not quite strong or consistent enough to be "convincing"
Limited Evidence – Suggestive
too limited for a grade of "probable", but a general consistency in the data
Limited Evidence – No Conclusion
too inconsistent or insufficient for a definitive grade
Substantial Effect on Risk Unlikely
enough evidence to rule out a connection