On the Caribbean island of Guadeloupe, a researcher examined 35 patients with atypical Parkinson's disease and compared their eating habits to those of 65 healthy adults. ███ █████ ████ ███ ██ ███ ████████ ████ ████████ ███████████ █████████ ███ ███ ████████ ██████ ████████ ███████ ██████ ███ █████ █████████ ███████ ████ ██ ██ ███ ███████ ██████ █████████ ███ █████ ███████ ████ █████ ███ █████████ ████ ██████ █████ ██████ ██████ ████████ ████████████
The researcher hypothesizes that eating soursop, custard apple, and pomme cannelle causes atypical Parkinson’s. This is supported by a study showing that a group of patients with atypical Parkinson’s regularly ate these fruits, whereas the majority of healthy adults studied did not.
Based on a mere correlation, the researcher assumes that eating certain fruits causes atypical Parkinson’s disease. This means assuming that the relationship is not reversed (e.g. atypical Parkinson’s causes one to prefer diet with such fruits), and that some hidden third factor is responsible for both the diet and atypical Parkinson’s.
The researcher also assumes that the selection methods used by the study didn't create the misleading appearance of a correlation between these factors.
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