One window into her world is the extraordinary way she responds to criticism: with legal threats and blatantly, outrageously misleading statements, emitted with such regularity that it's reasonable to assume she will do the same thing with this current kerfuffle over her use of the title "doctor". So that you know how to approach the rebuttals to come, let's look at McKeith's rebuttals of the recent past.
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Now, once would be unfortunate, but this is an enduring pattern. When McKeith was first caught out on the ridiculous and erroneous claims of her CV - she claimed, for example, to have a PhD from the reputable American College of Nutrition - her representatives suggested that this was a mistake, made by a Spanish work experience kid, who posted the wrong CV. Except the very same claim about the American College of Nutrition was also in one of her books from several years previously. That's a long work experience stint.
She even sneaked one into this very newspaper, during a profile on her: "Doubt has also been cast on the value of McKeith's certified membership of the American Association of Nutritional Consultants, especially since Guardian journalist Ben Goldacre managed to buy the same membership online for his dead cat for $60. McKeith's spokeswoman says of this membership: "Gillian has 'professional membership', which is membership designed for practising nutritional and dietary professionals, and is distinct from 'associate membership', which is open to all individuals. To gain professional membership Gillian provided proof of her degree and three professional references."
Well. My dead cat Hettie is also a "certified professional member" of the AANC. I have the certificate hanging in my loo. Perhaps it didn't even occur to the journalist that McKeith could be wrong. More likely, of course, in the tradition of nervous journalists, I suspect she was hurried, on deadline, and felt she had to get McKeith's "right of reply" in, even if it cast doubts on - I'll admit my beef here - my own hard-won investigative revelations about my dead cat. I mean, I don't sign my dead cat up to bogus professional organisations for the good of my health, you know.
But those who criticise McKeith have reason to worry. McKeith goes after people, and nastily. She has a libel case against the Sun over comments they made in 2004 that has still not seen much movement. But the Sun is a large, wealthy institution, and it can protect itself with a large and well-remunerated legal team. Others can't. A charming but - forgive me - obscure blogger called PhDiva made some relatively innocent comments about nutritionists, mentioning McKeith, and received a letter threatening costly legal action from Atkins Solicitors, "the reputation and brand-management specialists". Google received a threatening legal letter simply for linking to - forgive me - a fairly obscure webpage on McKeith.
She has also made legal threats to a fantastically funny website called Eclectech for hosting a silly animation of McKeith singing a silly song, at around the time she was on Fame Academy.
Most of these legal tussles revolve around the issue of her qualifications, though these things shouldn't be difficult or complicated. If anyone wanted to check my degrees, memberships, or affiliations, then they could call up the institutions, and get instant confirmation: job done. If you said I wasn't a doctor, I wouldn't sue you; I'd roar with laughter.
If you contact the Australasian College of Health Sciences (Portland, US) where McKeith has a "pending diploma in herbal medicine", they say they can't tell you anything about their students. When you contact Clayton College of Natural Health to ask where you can read her PhD, they say you can't. What kind of organisations are these? If I said I had a PhD from Cambridge, US or UK (I have neither), it would only take you a day to find it.
But McKeith's most heinous abuse of legal chill is exemplified by a nasty little story from 2000, when she threatened a retired professor of nutritional medicine for questioning her ideas.
Shortly after the publication of McKeith's book Living Food for Health, before she was famous, John Garrow wrote an article about some of the rather bizarre scientific claims she was making. He was struck by the strength with which she presented her credentials as a scientist ("I continue every day to research, test and write furiously so that you may benefit ..." etc). In fact, he has since said that he assumed - like many others - that she was a proper doctor. Sorry: a medical doctor. Sorry: a qualified conventional medical doctor who attended an accredited medical school.