A 2.2-6.6% self-reporting of reactions to chocolate are reported in two questionnaire surveys (Niestijl Jansen et al. 1994, Young et al. 1994). In an American population-based birth cohort study of 480 children followed up to three years old, 1.7% complained of adverse reactions to chocolate, but none was confirmed on food challenge (Bock 1987), and chocolate is rarely a cause of positive food challenge in allergy clinics (Bock et al. 1988, Crespo et al. 1995). It is likely that the majority of the reported reactions are to other components in the chocolate, for example cows' milk and nuts.
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