That figure fell to 15% when the researchers looked only at women. There was also a direct link between the amount of coffee consumed and the extent of protection conferred, with only those drinking several cups a day gaining the full 25% reduction in risk. Although the protective properties of coffee had been suggested before the evidence proved conflicting.
This latest research collated information from 26 different published studies in drawing its conclusions. According to the researchers, the study “confirms an inverse association between caffeine intake and the risk of PD, which can hardly by explained by bias or uncontrolled confounding.”
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