Why are some People Lactose Intolerant? + more videos |

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Lactose intolerance is basically the inability to digest a sugar called lactose found in dairy products. Usually, our small intestine produces an enzyme called lactase. Lactase breaks down lactose into simple sugars called glucose and galactose so that they can be absorbed into the bloodstream. However, people having lactose intolerance produce very little or no lactase at all. Hence, the undigested lactose passes into the large intestine where millions of bacteria break it down, leading to the production of excess water and gas, thus causing bloating, abdominal cramps, diarrhea, etc.
Lactose intolerance is of two types. First is primary lactose intolerance in which individuals sufficiently produce lactase during childhood, but gradually its production decreases as they age. Then comes secondary lactose intolerance which occurs due to some illness or injury to the small intestine, causing it to temporarily decrease the production of lactase.