Niki Bezzant sheds some light on the gut issue we're not so keen to talk about: constipation.

We're all quite interested in gut health these days. You can't turn around without coming across a new fermented food or drink; whole chiller is devoted to kombucha at my local supermarket now. New cereals being launched to the market are often promoted for their gut-bacteria-boosting qualities. Worldwide Google searches on "gut health" have increased, we are told, 10-fold in the past decade.

But there's one gut issue we're less keen to talk about, although it probably affects more of us, at one

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