There are many causes of body swelling. In addition to cardiogenic, nephrogenic, hepatogenic edema and edema caused by local lesions, patients with malnutrition may also develop body swelling. For edema caused by malnutrition, first of all, we should carry out targeted treatment according to the cause, and secondly, we should enhance nutrition appropriately and eat more food rich in high-quality protein, such as meat, eggs, milk and soy products. For patients who cannot eat or do not eat enough, high protein supplements such as whey protein powder, including soy protein powder or mixed protein powder, or enteral or parenteral nutritional support therapy can be given. For patients with severe edema, human albumin should be supplemented to increase plasma colloid osmotic pressure to reduce edema. In addition to protein supplementation, salt intake should be limited to 3g per day, and foods high in sodium, such as sausage, bacon, and salted vegetables, should also be controlled, also with the aim of reducing water and sodium retention in the body.