Today I review an article published only a month ago in July 2019. This has fascinating applications for our understanding, and where our lack of understanding is, of the human gut biome. These particular strains of bacteria in the Veillonella group rely exclusively on lactic acid for their food. Not only do we have this in our gut naturally, but marathon runners tend to have a larger proportion of them. There may be potential for our DNA to directly influence these gut bacteria, could the reverse also be true? Tune in to learn about the fascinating implications that we've discovered.