Why some people gain weight eating the same food | Dr Karen Corbin

Gut microbiome composition significantly influences how much usable energy the body extracts from food, challenging the traditional view that weight gain is solely a function of caloric intake. Registered dietitian and scientist Dr. Karen Corbin explains that individuals can absorb over 100 calories more or less daily based on their microbial community’s ability to ferment undigested food. A high-fiber, whole-food diet supports a "fed and happy" microbiome, which may help regulate body weight and improve metabolic markers like blood sugar and liver fat. While current research highlights the potential for microbiome-targeted interventions in managing obesity and chronic diseases, the field is shifting toward understanding community dynamics and specific metabolites rather than simple species identification. Future clinical strategies will likely integrate objective dietary biomarkers and personalized metabolic profiles to optimize health outcomes beyond standard nutritional recommendations.