Marsha Wibowo, a doctoral student at Harvard Medical School, and Aleksandar Kostic, their microbiology professor, have been trying for several years to understand why chronic autoimmune and metabolic diseases that affect humans have increased dramatically in recent decades. “One of the keys to solving the question lies in the changes in our intestinal microbiota,” says by email Kostic, co-author with Wibowo of research that reveals how the bacteria in our intestine have been transformed from the time of Christ to today.
