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What does lactose intolerance involve?

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Lactose intolerance involves the digestive system: If you have it, your body doesn’t make lactase, the enzyme needed to digest lactose. That’s the sugar in milk. Instead of digesting normally in your stomach and small intestine, undigested lactose moves into your colon, where it’s broken down by bacteria and causes bloating and gas. It can be uncomfortable, but it’s not dangerous.

Lactose intolerance is common in adults – about 30 million Americans have it by age 20. It’s more common in people with Asian, African or Native American heritage and less common in people with a northern or western European background.

SOURCES:

American Academy of Allergy Asthma & Immunology: “Anaphylaxis,” “Anaphylaxis Quiz.”

Food Allergy Research & Education: “Milk Allergy,” “About Anaphylaxis,” “Blood Tests.”

Mayo Clinic: “Lactose intolerance,” “Milk allergy.”

MedlinePlus: “Lactose intolerance.”

UptoDate: “Milk allergy: Clinical features and diagnosis.”

Reviewed by Sabrina Felson on June 25, 2019

SOURCES:

American Academy of Allergy Asthma & Immunology: “Anaphylaxis,” “Anaphylaxis Quiz.”

Food Allergy Research & Education: “Milk Allergy,” “About Anaphylaxis,” “Blood Tests.”

Mayo Clinic: “Lactose intolerance,” “Milk allergy.”

MedlinePlus: “Lactose intolerance.”

UptoDate: “Milk allergy: Clinical features and diagnosis.”

Reviewed by Sabrina Felson on June 25, 2019

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What does dairy allergy involve?

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