Most xylitol manufacturers produce the food additive by hydrogenation, a process that treats xylose with hydrogen and a catalyst, typically nickel. Hydrogenated foods contribute to behavioral issues, cancer, and Alzheimer's disease. Nickel is a toxin that research has linked to asthma attacks, kidney problems, indigestion, lung disorders, and skin allergies. While studies have not found a direct correlation between xylitol and these conditions, the hydrogenation process is worthy of consideration when choosing this sugar alternative.

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