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A glass of milk beside a small jug and a bowl of plain yogurt on a light table.
Health

Is lactose intolerance the same as a milk allergy?

Published

Verdict
False
Verification confidenceHigh

Explanation

No. Lactose intolerance and milk allergy are different conditions. Lactose intolerance concerns the digestion of lactose, a sugar in milk. Milk allergy involves an immune response to one or more milk proteins.

NIDDK explains that insufficient lactase, the enzyme that breaks down lactose, allows undigested lactose to reach the colon, where it can cause digestive symptoms. The NHS independently identifies low lactase levels as the most common cause and distinguishes food intolerance from food allergy.

The distinction matters because an allergic reaction to milk can be life threatening, whereas lactose intolerance does not operate through that allergic mechanism. These definitions explain the conditions; they do not establish the cause of an individual's symptoms.

Key takeaway

Milk sugar and milk proteins are different triggers. Lactose intolerance and milk allergy are not interchangeable diagnoses.

Evidence

Different substances and biological mechanisms

National Institute of Diabetes and Digestive and Kidney Diseases

Contradicts the claim

NIDDK distinguishes impaired digestion of lactose from an immune response to milk proteins. Its explanation directly identifies lactose intolerance and milk allergy as different conditions.

Based on: National Institute of Diabetes and Digestive and Kidney Diseases

Independent guidance separates intolerance from allergy

NHS

Contradicts the claim

The NHS describes lactose intolerance as commonly resulting from insufficient lactase and explicitly distinguishes food intolerance from potentially life-threatening food allergy.

Based on: NHS

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