 So it's colonized with all these bacteria. Now, that fiber that you eat, or that undigested food that gets in there, that starts to feed the bacteria. So when the bacteria eats the fiber, it eats this stuff, what happens is it secretes, and I always tell my patients, I'm like, it poops out the byproduct, because that's what's happening, and that byproduct afterwards is what is nourishing for us, for us as humans. And so we have a symbiotic relationship with the probiotics in our gut.