Each body is different, so it can be difficult to give general advice about what foods should be avoided. When you eat a certain food, pay attention to how you feel afterwards. By doing this you will soon be able to pinpoint what food or foods are causing problems. Talk to your doctor to see if you may have an allergy to a certain food, gluten sensitivity, or celiac disease. Be particularly mindful about the following foods:  Processed foods, including fast food, white bread, sausage, donuts, hamburgers, and potato chips. Dairy products can cause stomach aches in some people, especially if they are unknowingly lactose intolerant. Try staying off dairy products for a week to see if there is improvement, or try a soy based milk.  Spicy and greasy food can irritate the stomach and should be avoided if you are experiencing stomach pains. The best foods to help with a stomach ache are high in fiber. Your stomach aches may actually be caused by a lack of fiber in your diet. It is also important that you drink water, approximately two to three liters per day (nine to 13 cups) is the recommended amount. Foods high in fiber include fruits like bananas, vegetables like broccoli, and many whole grains. Prunes, cherries, raisins, and apricots are particularly effective. These foods will help with regular bowel movements and prevent constipation. Healthy foods like beans, broccoli, cabbage, and yogurt make gas in your stomach and can cause stomach pain. Eat these foods in moderation. To help prevent gas chew these foods (and others) thoroughly, and do not swallow too quickly. Drinking ginger ale can relieve stomach aches caused by gas. After you drink, you can try to burp or pass gas to relieve pressure. Over the counter Gas-X may also help. Overeating can cause discomfort and stomach pain, even if you eat too much of a healthy food. Try not to get all of your calories in one or two big meals; instead, spread out your calories in three meals and one to two healthy snacks. To ease the load on your stomach, here is a...

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Write a summary of the previous text in Vietnamese:
Tránh một số thực phẩm. Ăn thức ăn và uống thức uống lành mạnh để giảm cơn đau bụng. Loại bỏ thực phẩm gây đầy hơi. Không ăn quá nhiều. Tránh tiêu thụ đồ uống chứa cồn. Giảm căng thẳng và lo lắng. Nghỉ ngơi đủ và có lối sống lành mạnh khi bị đau bụng kinh.