Do I Have a Casein Allergy?

2. Casein Allergy vs. Lactose Intolerance

So while a person with a lactose intolerance lacks the necessary enzyme needed to digest the lactose in milk; a person (like me) with a casein allergy suffers an immediate and pretty severe immune reaction to the casein in milk, which causes a severe and misguided immune system response as the body tries to protect itself against the foreign substance or threat.

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