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Observational studies are not reliable to draw conclusions however. It can give you hints, but its not science.

ANd I would not give too much credit to the present study described here, the sample size is so limited (less than 200) that it's not even remotely significant.

Modern clinical studies on Al-Zheimer recruit several thousands participants over the span of several years, with appropriate medical follow up. Observational studies are the equivalent of qualitative studies in consumer researches...



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