University of Granada (Spain) researchers evaluated studies that support the consumption of whole grain cereals and bread, key components of the Mediterranean diet, to prevent chronic diseases. Several studies have consistently shown that subjects who ingest three or more portions of whole-grain cereal-based foods per day have a 20-30% lower risk of coronary vascular disease than subjects who ingest low quantities of cereals. This level of protection is not observed with ingestion of reﬁned cereals. Similarly, high intake of whole grain cereals and their products, such as whole-wheat bread, is associated with a 20-30% reduction in the risk of type-2 diabetes. Finally, regular consumption of whole grain cereals and derived products has shown protection against the risk of colorectal cancer and polyps, other cancers of the digestive tract, cancers related to hormones, and pancreatic cancer, as well.
Journal of Public Health Nutrition 2011 Dec; 1412A):2316-22 (Gil et al.)