Rosie McCall 26 Sep 2018, 11:36

The Conversation

Opening your bowels is a basic function of life. But despite the fact we all do it, pooing is not often thought to be a topic suitable for polite conversation. However, recent popular interest in gut health and the composition of poo – as well as the bacterial populations that live within it – have helped to put bodily functions more on the map. And these days, more and more people are wondering how often you should go, what happens if you don’t go enough and how you can influence the composition of what is passed.

In the late 1980s, Professor Ken Heaton and colleagues conducted a survey of the population in East Bristol, in the UK. They reported the common wisdom that “99% of people defecate between three times per week and three times per day” which was revealed in an earlier study of factory workers and GP patients. In Bristol, they noted that although the most common bowel habit was once daily, it only occurred in 40% of men and a third of women.

How often we go for a number two can differ from person to person. We all have what’s known as a “gastro-colic reflex” – which means that each time we eat food, our large bowel responds and we should go to the toilet. Through a range of hormones we will experience a “call to stool”. Most of us, however – from the time we can walk – suppress this call, so once a day or less has become the new norm.

Urgency, diarrhoea, and constipation can all be features of not going to the toilet enough. And associated with this “relative” constipation are symptoms of bloating, pain and variability of bowel habit. A simple test of how your bowels are working is the “sweetcorn test”. By swallowing a handful of raw sweetcorn – which is not absorbed by the body – the brightly coloured kernels can be easily seen in your motions. This is an easy way to assess your own mouth-to-anus transit time. It should probably be about eight hours.

The composition of poo

Poo is made up of 75% water. The rest, which is the solid stuff, is up to 50% microbes plus cells that are shed from the bowel lining and food residue. The collective name for the microbes that live inside us is the microbiome and at one time, it was thought that the bugs outnumbered our cells by ten to one.

Recent data suggests this may be closer to a ratio of 1.3 to 1 but this will obviously depend on how often you go. Bacteria, viruses, fungi and single cell microbes make up the microbiome and all may be critical to our health and well-being.

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