Inside our intestines, there’s an entire ecosystem – our own “inner rainforest” – made up of microorganisms so small that millions could fit into the eye of a needle. But these tiny bugs that live in our gut are proving key to human health and the obesity epidemic. See: Microbes: the hidden reason behind obesity? Here is a direct video link. (only plays in Canada)
Also see this list of the Top 10 gut friendly foods.