Lactose Intolerant People May Soon Be Able to Eat "Real" Ice Cream Again

After childhood, about two-thirds of the world’s human population loses the ability to digest milk. As far as we know, 100% of nonhuman mammals also lose this ability after weaning. The ongoing ability to digest lactose, the main sugar in milk, into adulthood is a biological abnormality.

Lactose cannot be directly absorbed in the intestinal tract and must, instead, be broken down into its two smaller component sugars by an enzyme called lactase. Normally, the activity of the gene that...

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