Beta-hydroxybutyrate spills into the gut and feeds the gut microbiota during extended fasting.

“beta-hydroxybutyrate is the main ketone body that's flowing all throughout our entire body when you're fasting or on a carnivore ketogenic diet so you're gonna have loads of butyrate in your body also and beta-hydroxybutyrate can be used as fuel by the colonic and taro sites and so you don't need butyrate I talked about this Alain on the podcast you don't need butyrate for your colonic epithelial cells to be healthy you can make other short chain fatty acids from amino acids namely propria Nate or I so butyrate and your body can use ketones directly to feed the epithelial cells in the gut”