Lactose intolerance is caused by a lessened ability or a complete inability to digest lactose, a sugar found in dairy products. Humans vary in the amount of lactose they can tolerate before symptoms develop.
Causes. Lactose intolerance happens when the small intestine doesn't produce enough of an enzyme called lactase. Lactase is necessary to digest milk sugar, called lactose. Usually, lactase turns milk sugar into two simple sugars, glucose and galactose.

More sensitive dogs, or dogs that consumed a larger amount of dairy, can develop watery diarrhea that lasts a day or two. The severity generally scales with the amount of lactose consumed. A lick of yogurt rarely causes problems; a full bowl of milk is a different story.

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Can you develop lactose intolerance or become lactose intolerant over time? Is lactose intolerance an allergy? What conditions can be mistaken for lactose intolerance?

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Lactose intolerance is a common cause of abdominal cramping, bloating and loose stools. This condition occurs when the body does not have enough of the intestinal enzyme lactase. The job of lactase is to break down lactose, the main sugar in milk.
Lactose Intolerance and Genes. Around 75% of the world's adults can't drink a lot of milk. And yet most could as a child. What's going on here? As you can guess from the numbers, being lactose intolerant is normal for an adult.