For instance, acupuncture works
Not if you read Ben Goldacre it doesn't.
Actually he is wrong. Very easy for someone who is ill-informed to make that statement.
It's been proven time and time again that acupuncture does work - and proven by mainstream Cartesian reductionist scientific method ie experiments designed according to the "gold standard" of scientific research method. Don't believe me? Go to your local university medical library and read the latest research published in top line peer-reviewed journals.
As I said, it's been proven over and over again to work way beyond the placebo effect. All forms of medicine have a placebo effect - about 30% effective, so if you're a health practitioner working at only a 30% success rate then you're only having a placebo effect.
The way in which acupuncture works is unknown but the effects of acupuncture (ie that it works) can be measured by many methods eg fMRI, biofeedback etc etc Some older, ill-informed biomedical writers insist it works on "gate theory" and such, but they are wrong too. Far more complex and as yet biomedicine doesn't have the technology to determine how it works.....just like many drug effects and body functions.
There is no form of medicine that is 100% effective - western biomedicine included. In addition, don't forget that western biomedicine also has a 30% placebo effect - a fact often conveniently forgotten by the masses.