Supplements can usually be taken about 1 to 3 days after gastric bypass surgery, depending on the patient’s recovery. Gastric bypass surgery, also called gastric diversion surgery, is mainly to anastomose between the stomach and intestines, which is a kind of minimally invasive surgery. If only local resection surgery is done, some supplementary food, such as rice soup, milk, soybean milk, etc., can be eaten generally about 1 to 3 days after surgery, and if no obvious complications occur, gradually transition to semi-liquid as well as soft food, and then transition to normal diet. However, if the patient’s recovery is slow or there are serious complications that affect eating, the resumption of complementary foods may be slower and take 2 to 3 weeks or even longer. You should pay attention to choosing light and easy-to-digest food for supplemental food after gastric bypass surgery to avoid causing indigestion. It is recommended to make choices under the guidance of your doctor.