Generally speaking, stomach cancer patients can drink soymilk in moderation, and it is not recommended to drink soymilk on an empty stomach. Soymilk is a kind of drink formed by processing soybean food, which contains vegetable protein, calcium, potassium and other nutrients, which can supplement protein and other nutrients needed by gastric cancer patients, and drinking it moderately is not harmful to gastric cancer patients. However, it should be noted that gastric cancer patients usually have weak gastrointestinal function during postoperative period or radiotherapy period, so if they drink a lot of soymilk or drink soymilk on an empty stomach, it is easy to aggravate the burden of gastrointestinal system or produce more gases, which will lead to indigestion, abdominal distension and other symptoms, which is not conducive to the recovery of gastric cancer patients.