Some coffees are labeled "stomach friendly," because they're steam treated to drive out caffeine and other chemicals thought to cause gastrointestinal distress. But food chemists [Veronika Somoza et al.] wanted to know exactly which chemicals were behind the heartburn. So they took extracts of two coffee blends—one light, one dark—and their steam-treated counterparts. Each extract proved to be a unique chemical mix, with different amounts of caffeine and other compounds.
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