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Welcome to Just Answer and thanks for your question. Gas in the intestines is a normal condition. Gas in the upper part of the intestine is usually from swallowing air, while gas in the lower part of the colon is usually produced by bacteria working on partially digested food. Very little gas is actually produced in the small intestine. To prevent gas, one should limit gas-producting foods (beans, carbonated drinks), avoid swallowing air, eat slowly and don't talk while chewing, increase exercise, limit lactose-containig foods (dairy foods), and when adding fiber to the diet, do it slowly so the body has a chance to become accustomed to the changes.