2 meta-analysis suggest decreased mortality from all causes with increased whole grain consumption

Whole grain consumption and risk of cardiovascular disease, cancer, and all cause and cause specific mortality: systematic review and dose-response meta-analysis of prospective studies – British Medical Journal (free)

Whole Grain Intake and Mortality from All Causes, Cardiovascular Disease, and Cancer: A Meta-Analysis of Prospective Cohort Studies – Circulation (link to abstract – subscription required for full text)

Eat whole grains, live longer? – New York Times commentary (free)