The placebo effect is the phenomenon that a patient's symptoms can be alleviated by an otherwise ineffective treatment, since the individual expects or believes that it will work. Some people consider this to be a remarkable aspect of human physiology; others consider it to be an illusion arising from the way medical experiments were conducted. The phenomenon, if it exists at all, is not fully understood by science.
The effect is reaffirmed by new research that reviewed 21 studies involving more than 46,000 participants altogether.
But the conclusion is not just that the power of positive thinking is at work, as other studies have shown.
Rather, taking medicine regularly and properly may indicate a person's overall tactical approach to health.
People who take their medicine regularly, even if it's a placebo, have a lower risk of death than those who don't, researchers report in this week's issue of the British Medical Journal. In fact, the risk of mortality was about half that of participants with poor adherence.
The reason may be that people who are good about taking their medicine are better overall at maintaining healthy behavior, the researchers write. It's also possible that people who fail to take their medicine have some other underlying condition such as depression, which can affect overall health.
The researchers, led by Scot Simpson of the University of Alberta, point out that one of the biggest challenges to physicians has long been getting people to take their medicine.
“Our findings support the tenet that good adherence to drug therapy is associated with positive health outcomes,” Simpson and his colleagues write. “Moreover, the observed association between good adherence to placebo and lower mortality also supports the existence of the healthy adherer effect, whereby adherence to drug therapy may be a surrogate marker for overall healthy behavior.”
The bottom line, according to a commentary on the findings by U.S. researcher Betty Chewning University of Wisconsin-Madison, Madison.
Healing may lie not in the treatment but rather in patients’ emotional and cognitive processes of “feeling cared for” and “caring for oneself.” Basing treatments on these ideas “could yield extra value in treatment regimens that patients agree to, believe in, and will sustain over time," Chewning writes.
Prepared by Alexander Timoshik
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