My first guess would be that those studies are probably poorly executed.
If they were indeed properly double-blinded and used good statistical analysis, I would find that to be and extremely interesting result that would warrant further investigation.
Is that supposed to be a citation? Try as I might I can't seem to find any further details on this study, which seems like it was conducted as part of a TV program rather than as a research paper.
If they were indeed properly double-blinded and used good statistical analysis, I would find that to be and extremely interesting result that would warrant further investigation.