Ted Kaptchuk, professor of medicine at Harvard Medical school - and leading placebo researcher, has just published an analysis on bmj.com describing the effect of open label placebo - placebos that patient's know are placebos, but still seem to have some clinical effect.

Ted joins us to speculate about what's going on in the body, what this means for designing a more effective placebo, and asking whether it's time to start honestly prescribing placebos in the clinic.

Read his full analysis: