Lactose is milk sugar, and as infants, humans produce substa…

Lactose is milk sugar, and as infants, humans produce substantial amounts of the lactase enzyme to digest it. However, as we age, we soon lose some or even all of this digestive enzyme. In such cases, undigested lactose passes to the lower intestine where bacteria break it down into lactic acid and CO2, causing painful gas and bloating. This problem could be avoided by avoiding dairy products or …