Dumoulin identifies fructose and lactose as cause of Giro d'Italia digestive problems

The image of Tom Dumoulin, in the maglia rosa, pulling over for an emergency toilet break ahead of the Stelvio will stand the test of time in Giro d'Italia legend, but the Dutchman is understandably doing everything he can to ensure the scenario doesn't repeat itself, and he thinks he's found the answer.

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