Flatulence comes from two places: swallowed air and fermentation in the bowel. Factors that might cause you to swallow extra air include chewing gum, wearing ill-fitting dentures, sucking on hard candies, drinking through a straw, eating too fast, talking while you eat, and smoking cigarettes. So, if the fear of lung cancer doesn’t get you to quit smoking, maybe fear of flatulence will. The main source of gas, though, is the normal bacterial fermentation in the colon of undigested sugars. Dairy products are a leading cause of excessive flatulence,52 which is due to poor digestion of the milk
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