Walnuts are round, single-seeded stone fruits that grow from the walnut tree. They are a good source of healthy fats, protein, and fiber. They may enhance heart and bone health and help in weight management. Walnut consists of a host of brain boosting nutrients that promotes brain function and development. and are a high-calorie food, and the inclusion of walnuts into your diet, especially for people who wish to gain muscle and healthy weight.