Yep. Was a fascinating case series, but with a very self-selected population making it hard to interpret in the context of populations
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So should we encourage people to join Facebook groups that encourage the cutting of carbs? Why does the populations part matter?
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Because self-selected populations make biased studies. If you're only looking at the people who a) join a FB group, b) see the post, c) respond to the post, and d) respond to the follow-up you're almost guaranteed to ignore anyone the intervention hasn't worked for
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