How strong is the evidence for Whole Grains?

Whole grain intake is supported by a large dose-response meta-analysis of prospective studies linking higher consumption to lower cardiovascular disease, cancer, and all-cause mortality, reinforced by a major Lancet series on carbohydrate quality and fiber, and an American Heart Association dietary guidance statement. That evidence is currently rated strong (80/100), built on 6 published studies, including 3 meta-analyses -- enough for real confidence in the effect.