The particular makeup of a newborn’s gut microbes is important as it has been shown to affect their risk of developing certain diseases later in childhood and adulthood.
For most of us, the form of stool we excrete can vary widely depending, in part, on what we've been doing.
The make-up of our gut is constantly changing and affects everything from our immune system and digestion, to our brain function.
Links have been made between the community of bacteria in your gut and depression, pain, stress and sleep. So what does the science say?
The human gastrointestinal tract harbours trillions of microorganisms, with up to 1,000 or so different bacterial species.
Human activities have altered whole ecosystems with declines in species diversity, extinctions and the introduction of weeds and pests. But it's not just the outside world we're harming.