2. Roasted walnuts can tonify kidney and replenish essence, because from the perspective of Chinese medicine diet, roasted walnuts are sweet and warm, and enter the kidney meridian. Therefore, for frequent micturition, urgency, soreness of waist and knees, lumbocrural pain, and decreased reproductive function caused by kidney-yang deficiency, if roasted walnuts are eaten properly, they can nourish kidney-yang, strengthen bones and muscles, and improve reproductive function.