A study on faecal microbiota transplantation for C. difficile connected donor bile acids and microbiota profiles to transplant success, adding mechanistic clues to why responses vary between recipients. In parallel, new evidence links diet-related carbohydrate counting training to improved glycemic parameters and reduced prandial insulin doses in type 2 diabetes on intensive insulin therapy. For translational and clinical audiences, the first study supports microbiome-informed selection and conditioning strategies for microbiota-based therapeutics. The second highlights that structured nutrition education can drive measurable metabolic improvements in insulin-treated patients, though post-hoc statistical significance depends on correction methods. Taken together, the updates underscore that both microbial ecology and patient behavior interventions can shape therapeutic outcomes, not just baseline disease risk.