Placebo effect makes no sense. Someone suffering from an infection will recover just as nicely whether they take medicine or a simple sugar pill. This seems to suggest that people are able to heal themselves unaided - so why the need to wait for a sugar pill?
Read article here: http://www.newscientist.com/article/mg21528812.300-evolution-could-explain-the-placebo-effect.html
Troy Robins - Certified Clinical Hypnotherapist based in Oxford & Witney, Oxfordshire in the UK.