I don't know who needs to hear this today, but the placebo effect probably isn't real and mostly describes common statistical failings of scientific research
Regression to the mean perhaps not, but there are also study effects to consider. Most people don't have a study nurse following up their weight and HbA1c every week for a year!
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OK, I missed something important: "both groups received counseling on lifestyle modification" So this example isn't actually informative
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Fair enough, but even if there was no counseling, there's abundant evidence that being enrolled in a study changes people's behaviourhttps://catalogofbias.org/biases/hawthorne-effect/ …
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