Whilst we know placebo’s work, I haven’t seen ‘regression to the mean’ mentioned in the thread.
This is a rule where everything returns to average/normal. So, if you have a chronic illness (such as multiple sclerosis), or a self limiting illness (viral chest infection), you seek out healthcare when you are at your absolute worst.
If you take a placebo or homeopathic treatment, the disease returns to normal (if a chronic illness) or resolves (if self limiting), and you attribute that change to the treatment. People have bad days with chronic illnesses and viral illness resolve on their own.
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