What causes lactose intolerance?

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I was not lactose intolerant until I was about 16. How is that possible? What changed inside of me to make me lactose intolerant?

I also heard that it is not an allergic reaction but is something else. Is this true?
 
I was not lactose intolerant until I was about 16. How is that possible? What changed inside of me to make me lactose intolerant?

I also heard that it is not an allergic reaction but is something else. Is this true?

You stopped creating or started insufficiently creating lactase. It's there for the breast milk and, over time, can stop being created as you grow out of infancy and start drinking beer.
 
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