Energy balance

Higher body mass index (BMI) in genetically identical individuals is associated with a gut microbiota network enriched in butyrate-producing bacteria (Eubacterium ventriosum, Roseburia intestinalis) and higher fecal butyrate/valerate levels, whereas lower BMI is associated with a network of primary fiber degraders (Oscillospira guillermondii).

This research suggests that a higher BMI is linked to a gut environment that produces more butyrate and valerate, driven by specific bacteria like Roseburia and Eubacterium. Conversely, a lower BMI is linked to bacteria that specialize in breaking down complex fibers (primary degraders). While this doesn't prescribe a specific diet, it highlights that the *function* of your gut bacteria (what they produce) may be more important for energy balance than just the total number of bacteria or simple ratios.