For our 69th episode, we review a paper in The Journal of Clinical Endocrinology & Metabolism on the gut microbiome of adolescents with type 1 diabetes, which hopes to understand differences between those with a normal body mass index compared to obesity. Studying gut microbiomes has been a “hot topic” for several years now, and we are excited to take the opportunity to unpack this work and see how it helps us better understand our patients. We both work through the challenges that come with any observational study and learn more about the specific techniques used by these investigators in this study. Host Chase Hendrickson, MD, MPH, MHCC, from Vanderbilt University talks with regular contributor Ashok Balasubramanyam, MD, from Baylor College of Medicine, and guest expert Åke Lernmark, MD, PhD, professor emeritus from Lund University in Malmö, Sweden. They discuss “Gut Microbial Changes Associated With Obesity in Youth With Type 1 Diabetes” by Ismail et al, published in the February 2025 issue of JCEM.