If you want to do a complete gut cleanse, you’ll need to start by eliminating foods that are known to irritate the digestive system, such as processed foods, dairy, gluten, and sugar. You’ll also want to increase your intake of fiber-rich foods, such as fruits, vegetables, whole grains, and legumes. Finally, consider taking supplements that support gut health, such as probiotics, digestive enzymes, and herbs like peppermint, ginger, and fennel.