Ulcer eating tips. It is not only important to watch what you eat when you have ulcers, but also how you eat your food can make a difference in managing symptoms. Break down your meals into five or six small meals. When you go for long periods without food, stomach acid accumulates and begins to irritate the ulcer. By eating small frequent meals, you’re making sure that the acid is constantly being used up to digest food, and not causing discomfort to your stomach lining. Eat only while sitting upright. Eat at least three hours before bedtime to allow your food to completely digest before going to bed. Take a few minutes to relax after each meal. Pay attention to what you eat and how it makes you feel afterward, this will help you to pinpoint any foods that trigger pain and discomfort.