what causes human gas
Even if you don't have any of these serious conditions, you still might experience gas. Other common causes of flatulence include: 1  Too much fiber too soon. 2  Lactose intolerance. 3  High legume diet-beans are legumes. 4  Fatty foods that you cannot digest. 5  Dairy products that you cannot digest or are allergic to. 6  Improper food combining.