This is an analysis of the overblown headline in the Daily Mail- UK. Observational studies are just that, observational, they don't prove anything, they suggest lines of research .
http://www.chorley-guardian.co.uk/news/health/can-grapefruit-stop-stroke-1-4741024
A couple lines here; rest at the link.
But on the basis of this study alone, there is no evidence that women who eat citrus fruits will reduce their risk of stroke.
The Daily Mail does not accurately represent the findings of the
study. Its headline, “How eating oranges and grapefruit can cut the risk
of a stroke”, contradicts the finding that there was no significant
association between intake of citrus fruits and juices and risk of
stroke.
Cohort studies such as this aren't ideal for showing cause and effect.
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