Problem poos, disturbed sleep and bad skin: The important signs you might have an unhealthy gut - and what you should be doing about it

Trillions of bacteria live in our guts - and it's important to keep them happy, or you could find yourself not only with an upset tummy, but feeling ill in whole host of ways.

It is often assumed that bacteria is bad, leading to illness and disease. But, in fact, bacteria is essential for keeping us fit and healthy.

Bacteria and other microbes, such as fungi and viruses, live in our guts, playing a critical role in digestion, immune function and weight regulation - this makes the gut one of the most important parts of our bodies, says world expert gastroenterologist and University of Manchester academic Professor Peter Whorwell.

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By not treating our guts right, we can end up feeling under the weather unexpectedly.

The consultant gastroenterologist has shared his knowledge from years of treating patients and research, now operating the South Manchester Functional Bowel Service.

Every gut is different, says the doctor. You shouldn't panic if you're not uncomfortable, and find out what feels normal for you.

But there are some common signs to watch out for and plenty of ideas to suggest for people who want to stay well.

"The gut is the centre of your health," he says.

"If it's working normally, you're more likely to be healthy."

An unhappy gut is like a blocked drain, says the Professor, and it desperately needs unplugging. That's why bloating and constipation could occur in people suffering from gut difficulties.

On the other end of the spectrum, people struggling with their gut might not be able to stop their bowel movements.

Bloating which gets worse as the day goes on can be a sign of irritable bowel