For years, the thinking around weight loss was as simple as "calories in, calories out." Well, new research is showing that it's way more complicated than that. Turns out that everything from our digestion, to our metabolism, to our immunity, is affected by the tiny germs that live in our gut.
Here's an infographic to break down the cutting-edge research on those bugs that live inside us, which are collectively called the human microbiome.
For a downloadable version, click here.