You’ve probably heard of xanthan gum, a common food additive in processed foods, but do you know how the ingredient might be changing your microbiome? Matthew Ostrowski, Ph.D., and Eric Martens, Ph.D. of the University of Michigan Medical School Department of Microbiology and Immunology, along with researchers at the Norwegian University of Life Sciences, seek to understand how food ingredients are changing our microbiomes, for better or worse.