Supplements Heart Health February 2011 Information gathered from the Nurses Health Study and published in the American Journal of Clinical Nutrition found that an increased dietary intake of magnesium was correlated with a decrease in sudden cardiac death in the women studied. Note that people who suffer sudden cardiac death often have no clinically identified cardiovascular disease. Also note that much of the US population does not get enough magnesium. Foods high in magnesium and low in glycemic load are: meats, fish, leafy greens, nuts and seeds, squash and pumpkin.