Now, Professor Regan is applying her trademark scientific training to examine the health credentials of an even wider range of products for her latest BBC2 series.
And not only has she discovered some bestsellers have little evidence backing them up, she believes many companies are, in fact, touting spurious claims. Here, she shares a few of her intriguing findings...
To prove this point, I developed my own diet pill and asked 17 overweight people to try it for a month, alongside a balanced diet and a sensible exercise plan. More than 70 per cent of the volunteers lost weight and believed the tablets had worked. Unbeknown to them, though, the tablets were simply sugar, a placebo - which shows the power of mind over matter. Yet I could easily use my results to launch an impressive marketing campaign, - as many companies do.
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