3. Flatulence
The fermentation of undigested lactose by bacteria in the colon produces gases like hydrogen, carbon dioxide, and methane. This leads to bloating, abdominal discomfort, and excessive flatulence. Not only is this highly uncomfortable, but it also can be incredibly embarrassing. Pay attention to how your body reacts when eating non-lactose containing foods versus lactose-containing, to see if you can notice an increase in gas and flatulence.