Has anyone heard of Neris and India's Idiot Proof Diet book or website?

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My sister received the book "Neris and India's Idiot Proof Diet" book from a friend in the UK recently and I looked over the book. It looks very interesting and down to earth even though I'm American and some of the foods and wording is a bit confusing to me. Both of the authors are real women who lost "5 stone" a piece. I'm not sure how much a "stone" is but I think it's 10-12 pounds. They have a website to at: http://www.pig2twig.co.uk/ If anyone has heard about this diet or tried it... what are your thoughts on it?