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We’ve all heard those phrases that denote a certain blindness to the passage of time. ‘She looks as young as the day I met her” husbands say of their wives 50 years into married life, or ‘haven’t they grown”, people tell me of my children. How about ‘it wasn’t even hot” said the frog, realising too late that he had sat unawares in the pot while the water slowly crept up to boiling point.

The thing is, we don’t tend to notice change if it’s gradual. Andaccording to a recent study from Georgia Southern University and published in Paediatrics, parents don’t recognise when their children have become obese.

Slow changes over time in anything we see every day become invisible and can be ignored – which is great for the ageing wives among us but not so helpful for frogs or children whose parents who should be taking notice so something can be done about it.

But is it just a matter of timing and what should parents do when they do eventually realise that something […]