Anyone who decides to have a gastric sleeve operation may no longer eat normal portions afterwards. There is no longer space for it. In this regard, a change in diet is absolutely necessary. Post-op nutrition must be slow and enjoyable, otherwise pain, nausea and vomiting are possible. In addition, drugs that could attack the mucous membrane of the stomach, such as aspirin or anti-rheumatic drugs, are strictly taboo. Patients usually begin a special diet immediately after the procedure. Only liquid food, such as broth, is allowed within the first four weeks after the operation. Only then does the slow diet change begin, with five to seven smaller meals per day.