A new study says that few nutritional supplements can protect people from developing or dying from heart disease. Researchers wanted to find out if 16 different nutritional supplements and eight special diets had an effect on the risk of heart problems and strokes. For the answer, the researchers examined results from 277 studies, which involved nearly one million people. Their findings were reported in the medical publication Annals of Internal Medicine. The United States Department of Agriculture has identified two diets, what it calls eating patterns, as examples of healthy ways to eat. The Dietary Guidelines for Americans 2015-2020 identifies one as the Mediterranean-style diet. It is rich in fruits, vegetables, legumes, whole grains, fish and healthy fats.