Is Whole Grains good for cardiovascular health?

Yes — the evidence for this is strong. 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's reflected in an evidence score of 80/100 for its role in cardiovascular health, drawn from 6 studies, with an estimated impact on longevity rated substantial (76/100).