An excellent diet for promoting longevity is a plant-based diet. A study published in JAMA Network Open found that women who most closely adhered to the plant-based Mediterranean diet, which emphasizes vegetables (excluding potatoes), fruits, nuts, whole grains, legumes, and fish, and minimizes red and processed meat, were 23% less likely to die from any cause than women who did not closely adhere to this dietary pattern. Source: Harvard Medical School