What you get: This versatile bean is best known for delivering a healthy amount of protein, and any form of the bean—be it edamame, tofu, tempeh, soy nuts or ground soy isolates used to make soy burgers—is an excellent plant source of high-quality protein. In addition, soy delivers fiber, some iron and the phytoestrogens daidizein and genistein, which are thought to have a wide range of health benefits for heart health and menopausal symptoms.