Why does lactose Intolerance happen?

I am not a professional nutritionist!

Hope you enjoyed this episode about lactose intolerance.

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Sources:

https://www.nhsinform.scot/illnesses-and-conditions/nutritional/lactose-intolerance#:~:text=Lactose%20intolerance%20is%20usually%20the,doesn't%20produce%20enough%20lactase.