The purpose of the current meta-analysis was to quantify the efficacy of barley and barley products on postprandial glycaemia. Determine whether the change in glucose response is enough to be considered physiologically relevant according to Health Canada's new guidelines. This study identified several areas requiring improvement that should be considered in planning future clinical studies. Study outcomes will have a significant impact on human health and nutrition, and help to advance the knowledge of barley as a nutritious cereal grain.