I am a firm believer in the idea that a little knowledge is dangerous. When you overhear a conversation in which one person says to another (imagine whatever derisory accent adds to the flavour-I always seem to hear Watford…):

"Yeah, ever since I watched that (insert celebrity TV show) the other day, I gave up (eating, drinking, buying) + (wheat, white wine, bleach…). Really makes you think, donnit?"

I always, always wince and imagine having the temerity (or bad manners) to break in with questions about the speaker’s level of intelligence, trust in an over-paid celebrity, or belief in a ridiculous cult of misinformation. Allergies seem to be a favourite topic in these conversations, I’ve noticed.

I find the proponents of these ideas far more galling, however. Dieticians, ’scientists’ from dubious academic associations, ’specialists’ and ‘independent consultants’: all these people ruin their very titles for the proper holders. Worse is when people go off half-cocked and make a mint selling their partially-formed philosophy.

I have just discovered a new breed in the person of Lee Siegel. I will, in the interests of transparency, state that I only heard about the man today, at about 16:30, and I know about him only what Wikipedia does, so not much, and therefore have only a limited platform from which to wince and whinge.