The phrase "fiber and protein" refers to two essential nutrients that are important for maintaining good health. Fiber is a type of carbohydrate that promotes digestive health by adding bulk to stools, helping them move through the intestines more easily. Protein, on the other hand, is an essential macronutrient that plays many roles in the body, including building and repairing tissues, making enzymes, hormones, and antibodies, as well as providing energy. Both fiber and protein are important for maintaining a healthy diet and lifestyle.