What Your Gut Has to Do With Belly Fat The gut microbiome β€” the 38 trillion bacteria inhabiting your digestive tract β€” influences fat storage through mechanisms that were barely understood a decade ago and are now central to obesity research. Specific bacterial populations extract more calories from the same food, influence whether eaten fat is stored or burned, produce neurotransmitters that affect appetite, and regulate the inflammatory environment that drives insulin resistance. Landmark research transplanting gut microbiota from obese mice to lean germ-free mice caused the lean mice to…