‘“Fat” is usually the first insult a girl throws at another girl when she wants to hurt her,’ I said; I could remember it happening when I was at school, and witnessing it among the teenagers I used to teach. Nevertheless, I could see that to him, a well-adjusted male, it was utterly bizarre behaviour, like yelling ‘thicko!’ at Stephen Hawking.

His bemusement at this everyday feature of female existence reminded me how strange and sick the ‘fat’ insult is. I mean, is ‘fat’ really the worst thing a human being can be? Is ‘fat’ worse than ‘vindictive’, ‘jealous’, ‘shallow’, ‘vain’, ‘boring’ or ‘cruel’? Not to me; but then, you might retort, what do I know about the pressure to be skinny? I’m not in the business of being judged on my looks, what with being a writer and earning my living by using my brain…

I went to the British Book Awards that evening. After the award ceremony I bumped into a woman I hadn’t seen for nearly three years. The first thing she said to me? ‘You’ve lost a lot of weight since the last time I saw you!’

‘Well,’ I said, slightly nonplussed, ‘the last time you saw me I’d just had a baby.’

What I felt like saying was, ‘I’ve produced my third child and my sixth novel since I last saw you. Aren’t either of those things more important, more interesting, than my size?’ But no – my waist looked smaller! Forget the kid and the book: finally, something to celebrate!