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Few dietary habits have been studied as extensively, and debated as much, as coffee drinking. Over the decades, coffee has swung between being flagged as a potential cancer risk and being credited with protective effects, sometimes within the same research literature just years apart. The honest, current picture is more reassuring and more specific than either extreme headline suggests, and it varies somewhat depending on which cancer type is being discussed.
This shifting history is itself informative: it illustrates how nutrition science evolves as better-designed, larger studies replace earlier research that had more limited methods or smaller sample sizes, and it is a useful reminder to view any single new coffee-and-cancer headline with appropriate caution.
