מחקר חדש שיצא-האם הוא אמין?

ד"ר יוסף דיין שלום רב. היום פורסם באתר אינטרנט מחקר מטה אנליזה שכלל בתוכו 67 מחקרים אחרים . סיכומו של המחקר היה שויטמינים מסויימים-ויטמין A ,בטא קרוטן,וויטמין E,אינם מועילים ואפילו גורמים לזירוז תהליכים הרסניים בגוף,ואף מזרזים תמותה. מהי דעתך על מחקר זה?

http://www.ynet.co.il/articles/0,7340,L-3532558,00.html

פלסיבו יקר=פלסיבו יעיל Costly placebo works better than cheap one 4/3/2008 A 10-cent pill doesn't kill pain as well as a $2.50 pill, even when they are identical placebos, according to a provocative study by Dan Ariely, a behavioral economist at Duke University. "Physicians want to think it's the medicine AND not their enthusiasm about a particular drug that makes a drug more therapeutically effective, but now we really have to worry about the nuances of interaction between patients AND physicians," said Ariely, whose findings appear as a letter in the March 5 edition of the Journal of the American Medical Association. Ariely AND a team of collaborators at the Massachusetts Institute of Technology used a standard protocol for administering light electric shock to participants’ wrists to measure their subjective rating of pain. The 82 study subjects were tested before getting the placebo AND after. Half the participants were given a brochure describing the pill as a newly-approved pain-killer which cost $2.50 per dose AND half were given a brochure describing it as marked down to 10 cents, without saying why. In the full-price group, 85 percent of subjects experienced a reduction in pain after taking the placebo. In the low-price group, 61 percent said the pain was less. The finding, from a relatively small AND simplified experiment, points to a host of larger questions, Ariely said. The results fit with existing data about how people perceive quality AND how they anticipate therapeutic effects, he said. But what's interesting is the combination of the price-sensitive consumer expectation with the well-known placebo effect of being told a pill works. "The placebo effect is one of the most fascinating, least harnessed forces in the universe," Ariely said.