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SOURCE: Ross, G. W., et al. (2000) Association of coffee and caffeine intake with the risk of Parkinson disease. Journal of the American Medical Association 283:2671–2679
INFOGRAPHIC 1.7 CORRELATION DOES NOT EQUAL CAUSATION
While the data shown below show a convincing correlation between reduced caffeine intake and an increased risk of Parkinson disease, it is impossible to state that less coffee causes Parkinson disease. Other factors that were not tested or controlled for could be causing the reduced risk.