Numerous animals, humans included, have adapted to living in cold climates by increasing their body size. And now, researchers have found that people living in colder regions have more obesity-related gut microbes than their warm-region counterparts. Are bacteria the reason why it's harder to lose weight in the snow?
When two populations of a species are separated for many generations, their genomes start to drift apart as they adapt to their different environments. Eventually they can become two distinct species. But new research now suggests it's not always incompatible DNA that halts interbreeding — sometimes it's incompatible…
Though you're born with an entirely sterile digestive tract, your guts fill with microbes as you grow up. In fact, these gut bugs outnumber your cells 10 to 1. And every species grows its own unique group of microbes.