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Could the well-documented association of caffeine intake with reduced incidence of Parkinson disease (PD) be due to its metabolites? Researchers addressed this question by using a case-controlled study that was nested within their larger EPIC4PD cohort, part of a longitudinal, multinational European study. They focused on incident PD cases and matched these to a control group with similar age, sex, study center, and fasting status. High-resolution mass spectrometry was performed on plasma to identify potential caffeine metabolites.
There were 351 incident Parkinson cases and 351 controls matched for age, sex, study center, and fasting status at blood sampling. In addition to caffeine, the paraxanthine and theophylline metabolites of caffeine…