You can eat potatoes half a year after surgery for duodenal descending tumor, but you should not eat too much. After the surgery of duodenal descending tumor resection, the intestinal function of the patient can be restored to normal only in one or two months, and the function of gastrointestinal tract is basically the same as that of normal people half a year after the surgery, and the potato can be consumed moderately because the rich carbohydrates in the potatoes can provide abundant energy for the organism. Potato starch content is relatively high, starch in the intestinal bacterial fermentation will produce a large amount of ammonia, hydrogen sulfide, eat too much will lead to a moment can not be discharged easily accumulated in the intestinal tract, thus causing gastrointestinal flatulence. At the same time, consuming more potatoes will easily cause excessive energy intake, resulting in weight gain, so it should be consumed in moderation. It is recommended that patients avoid eating indigestible food to avoid burdening the stomach and intestines, and should have regular checkups within one or two years after the surgery to prevent recurrence of the disease.