Associate professor of medicine Ted Kaptchuk at Harvard Medical School says:
- "These findings suggest that rather than mere positive thinking, there may be significant benefit to the very performance of medical ritual. I'm excited about studying this further. Placebo may work even if patients know it is a placebo."
The phenomenon of an inert substance resulting in a patient's medical improvement is called the placebo effect. The phenomenon is related to the perception and expectation which the patient has; if the substance is viewed as helpful, it can heal, but if it is viewed as harmful, it can cause negative effects, which is known as the nocebo effect.
However, what if patients knew they were taking a placebo? Would positive thinking be enough? Kaptchuk teamed up with colleagues at Beth Israel Deaconess Medical Center (BIDMC) to find out.
Eighty patients suffering from irritable bowel syndrome (IBS) were divided into two prescribed groups. The controls received no treatment. The second group received placebo cycles which were openly described as such. Subjects were told to take the pills twice per day.
- "Not only did we make it absolutely clear that these pills had no active ingredient and were made from inert substances, but we actually had 'placebo' printed on the bottle. We told the patients that they didn't have to even believe in the placebo effect. Just take the pills."
Senior study author Anthony Lembo, HMS associate professor of medicine at BIDMC and an expert on IBS stated:
- "I didn't think it would work. I felt awkward asking patients to literally take a placebo. But to my surprise, it seemed to work for many of them."
"Placebos without Deception: A Randomized Controlled Trial in Irritable Bowel Syndrome"
Ted J. Kaptchuk, Elizabeth Friedlander, John M. Kelley, M. Norma Sanchez, Efi Kokkotou, Joyce P. Singer, Magda Kowalczykowski, Franklin G. Miller, Irving Kirsch, Anthony J. Lembo
PLoS ONE 5(12): e15591. doi:10.1371/journal.pone.0015591
Written by Sy Kraft, B.A.