Everyone’s talking about the gut microbiome these days.

It’s buzzy, it’s everywhere, and for good reason.

Trillions of tiny, living microbes in your gut - invisible to the naked eye - influence everything from digestion and immunity to emerging links with brain health.

But because it’s so complex, it’s sometimes hard to know what to say beyond the basics. Just saying “it’s important” only gets you so far.

So here are 9 surprising microbiome facts your friends probably don’t know. Nerdy, fascinatin...