Leek and pork loin are both kidney-tonifying foods, which have a certain effect on men. Tonifying the kidney, a term in Chinese medicine, refers to changing the state of kidney deficiency through diet, medicine tonic, fitness exercise, qigong, acupuncture and massage. Kidney-tonifying ingredients include the following: yam is flat and sweet. It is the "top grade" medicine in traditional Chinese medicine, which can not only tonify the lung and spleen, but also tonify the kidney and replenish the essence. As Li Mingzhizhen pointed out, Chinese yam "benefits kidney qi and strengthens spleen and stomach" and "Herbal Zheng Zheng" also contains: "Chinese yam can strengthen spleen and tonify deficiency, nourish yin and strengthen kidney, treat all kinds of deficiency and treat five strains and seven injuries." The Classic of Materia Medica also says: "Yam can tonify kidney and replenish essence, strengthen vital energy and yin, and improve eyesight and hearing." Every top-grade medicine should be taken for a long time, ranging from lifelong to several years, and it must be combined with people who raise grain to achieve the goal of longevity. "So, anyone with kidney deficiency should always eat.