The cause of lactose intolerance is entirely genetic, it’s a gene that gets turned off mostly by age but also compounded by the lack of lactose (so if you don’t drink milk for a long period, the gene starts to turn off).
Genetic solutions are still cutting edge and because this problem has non-genetic solutions already (lactase pills or lactose free products) not to mention the effect of lactose intolerance is not life threatening, there’s really no reason to look for a genetic solution.
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