Thank you for posting this, Anasuya. Timely posting, I should say. I'm in the process of reviewing and editing the TN chapter on cancer and I'm finding similar information everywhere. What's particularly frustrating is that when I can read the details of a study, not just the abstract, I'm often finding that when study authors say "meat," they're including grocery store fresh meats (factory-farmed) along with fast-food burgers and processed meats, such as sausage, luncheon meats, and salami. From this diverse selection, they're making broad, all-encompassing statements. And I've seen no studies that have compared pastured and wild meats of any kind -- bird or beast -- with commercial.
There is, however, a group of researchers out of Cal State Chico and UC Davis who have been working together for close to a decade, maybe longer, on discerning the nutritional differences between pastured beef and industrial. Their 2010 findings are that pastured beef, compared to grain-fed, contains more beta-carotene (who even thought of meat as a source of this?), vitamin E, and "cancer fighting antioxidants such as glutathione (GT)
and superoxide dismutase (SOD) activity." Pastured also contains a different array of saturated fatty acids, ones that are less associated with raising blood lipids.
Now, this is nutrient content, not a study on cancer prevention, but in searching the literature, I'm finding almost nothing about meats causing cancer. In fact, I'm finding retractions of such statements made in earlier studies. The greatest dietary evidence for cancer that I'm seeing is for diets high in refined carbohydrates, and alcohol, too, in some instances. On the other side of the equation, i.e., what is truly cancer-preventive, it's naturally that which we Americans have too little of in our diets: plant foods, especially vegetables.
What I also never see mentioned is what is meant by "high," as in diets high in meat. And what else are these folks eating? Just meat? Meat and potatoes? Or, does their diet contain a large array of colorful fruits and vegetables? This is the study I want to see.