Generally speaking, there are many kinds of foods that tonify kidney yin, such as medlar, black beans and black rice. The specific analysis is as follows:

1. Lycium barbarum: Lycium barbarum is common in life. It is not only a food, but also a Chinese medicine. It can play a role in tonifying kidney, replenishing essence, nourishing liver and improving eyesight, and can effectively improve symptoms such as weakness of waist and knees and weakness of limbs caused by kidney yin deficiency.

2. Black beans: As a common food, black beans are rich in nutritional value, such as protein, amino acids, calcium, iron, zinc and manganese. It can not only meet the nutritional needs of the human body, but also play the role of nourishing yin and tonifying kidney, strengthening the body and warming the stomach.

3. Black rice: Black rice is rich in protein, fat, calcium, iron, zinc and selenium. It has the effects of nourishing yin and tonifying kidney, and is helpful to improve the symptoms of sexual life quality decline and general fatigue caused by kidney deficiency.

For patients with kidney yin deficiency, besides diet conditioning, they can also be treated with drugs under the guidance of doctors. Commonly used drugs include Zuogui Pill, Liuwei Dihuang Pill and Dabuyin Pill.