It might seem surprising, but some of the trillions of bacteria in our human microbiome are actually magnetic! These bacteria each carry a tiny, nanometer-sized piece of magnetic iron. Scientists believe that these magnetic microbes play a role in our sense of spatial awareness, known as proprioception. Thanks to proprioception, we can perform actions like kicking a ball without looking at our foot or orienting ourselves while taking a walk. In nature, this "built-in compass" has a remarkable role; for example, it helps migrating birds navigate long, extraordinary journeys over days and nights.
Most of our microbes are concentrated in the gut, where they have a powerful influence on the gut-brain connection. Changes in our gut microbiome can directly impact brain function and emotions. Recent research suggests that gut microbes may also subtly influence our proprioception. Interestingly, when migrating birds are given antibiotics, which disrupt their healthy gut microbiome, they can lose their ability to navigate. This highlights the importance of a balanced microbiome not only for overall health but also for functions we’re just beginning to understand.
Currently, a wealth of research is focused on unraveling the many roles of the human microbiome. In the future, this could lead to the development of "gentle" treatments that avoid the need for antibiotics, which are becoming less effective due to overuse and antibiotic resistance.