Did you know that bacteria line your intestines and help you digest food? During digestion, the bacteria helps make vitamins that are vital for the body, helps send signals to the immune system, and make small molecules that can help your brain work. Gut bacteria also effects your body’s metabolism by determining how many calories you get from food. Too much gut bacteria can make you turn fiber into fatty acids. This may cause fat deposits in your liver, which can lead to something called metabolic syndrome (a condition that often leads to type 2 diabetes, heart disease, and obesity).