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So how does the lactose intolerance scientists have recorded come into all this? It’s something Dubois has wondered about for years. “When I first started the project, I would walk up to strangers drinking milk and ask how they deal with digestive problems,” he says. “The answer was consistent: "If it bothers me, I stop.”   Additionally, people didn’t seem to seek out lactose-free milk, although such products can be found if you look.

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