Duodenal ulcer is a wound at the opening of the small intestine, which is caused due to some infections, some bacterial infections and some kind of medication like aspirin and ibuprofen. So when you have this ulcer, you have to limit your spice and oily foods you have to avoid. You have to take mild foods without spices and without much oil like chapattis with home prepared fresh curd, dals, some boiled vegetates with very little spices and khichdis, pongals and soups and warm water will also be helpful, some juices, all the bled foods which are available. You have to restrict any caffeine, tea coffee etc and pepper, chillies which cause the stomach to irritate and also alcohol. Alcohol does not allow the proper healing of the intestine. So you have to avoid alcohol. So take warm water during the whole day in sips and I also give some nutritional therapeutic treatment. I give some kind of supplements which help in duodenal ulcer in fats healing. Something like Vitamin B complex, and combined with Omega 3 essential fatty acids and some others depending on the need of the person. Eating smaller meals at shorter intervals also would help you by not stretching your stomach too much and also keeping a food diary. Also you can see which foods irritate you. So these tips will help you. So stay healthy.