A placebo even effects when the patient knows that he has been given medication without any substance. This was shown by researchers of the Harvard Medical School in Boston now. Pain and discomfort of 80 patients with irritable bowel syndrome was improving, although they knew that they have been given medication without substance. This finding disagrees with the popular theory of the placebo effect, based on the success of drug-free products on the firm belief of the patient. The researchers suggest that the medical ritual of taking a drug is may be enough achieve positive effects

Source: Forum of health 1/2011, Page 10