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It is somewhat surprising that little attention has been drawn to the existence of the contrary effect [to the placebo] – which I may call the nocebo reaction.
2009 April 25, Stuart Blackman, “Why health warnings can be bad”, in Financial Times:
In the case of the nocebo, it is negative expectations that become self-fulfilling prophecies.
2014 May 15, Jennifer Welsh, “Researchers who Provided Key Evidence for Gluten Sensitivity have now Thoroughly Shown that It Doesn’t Exist”, in Business Insider, archived from the original on 2 July 2017:
It seems to be a "nocebo" effect – the self-diagnosed gluten sensitive patients expected to feel worse on the study diets, so they did.
If there's one lesson to be drawn from the nocebo effect, it's that ideas are never merely ideas. […] Maybe you see where I'm going with this: our grim view of humanity is also a nocebo.