Brain atrophy is a common condition among older patients, characterized by symptoms such as memory decline. Treatment may involve the use of medications that invigorate the blood, improve cerebral circulation, and nourish brain cells. Additionally, dietary therapy can include foods or medicines that nourish the kidneys, and it is recommended to consume more walnuts regularly. Why do foods that nourish the kidneys treat brain atrophy? According to traditional Chinese medicine theory, the kidneys govern the bones and produce marrow, and the brain is the sea of marrow; thus, nourishing the kidneys can treat brain atrophy. Regular consumption of foods like Chinese yam and goji berries is encouraged. These can be added to soups and porridges to help nourish the kidneys and brain, and treat brain atrophy.