Nutritional intervention for individual patients has a wide range of postoperative food adaptability, so an individual evaluation is required. The medical institution intends to examine the contents of nutritional arbitration conducted on patients who underwent gastric surgery, examine the results, identify the nutritional problems that can be seen through the course of the patient's meal process, and share the clinical experience. In this case study, a 46-year-old female patient was diagnosed with morbid obesity, impaired fasting glucose and hypertension. She was 153 cm tall and weighed 88 kg, with a body mass index 37.6 kg/m² at initial evaluation. The patient maintained normal biochemical data before and after surgery and shows postoperative weight loss, body fat reduction, and abdominal fat reduction. In this case, blood sugar and blood lipid levels improved after weight loss. The repeated nutritional intervention for a sleeve gastrectomy patient, which is performed by clinical dietitians, is as follows. A balanced diet, supplemented with vitamins and minerals, is very important for preventing nutritional complications after obesity surgery. In conclusion, for stomach surgery patients, a multidisciplinary approach and continuous nutritional management, motivation for weight loss, postoperative dietary adaptation, and individual access to patients are most important.