Fiber is a carbohydrate, and dietary carbohydrates can be separated into two categories: monosaccharides and polysaccharides (via Science ABC). While our digestive organs can successfully process monosaccharides into sugar molecules, our bodies aren’t equipped with the enzymes needed to break down fiber, which is a polysaccharide. Therefore, fibrous foods like seeds, corn, fruit and vegetable peels, nuts, and more may unexpectedly turn up again after using the bathroom.
In some instances, finding undigested food in your poop may alternatively signal a potential health condition. This can include inflammatory bowel disease (IBD), lactose intolerance, or celiac disease, explains WebMD. It may also be indicative of a condition specific to the pancreas, an organ that produces enzymes to support digestion. However, pancreatic cancer, cystic fibrosis, or pancreatic insufficiency can all impact the organ’s functioning, making it challenging for the body to break down food. Most often, undigested food in one’s poop will not be the only symptom a person experiences if the cause is due to a health condition. One might also experience diarrhea, pain, fever, bloating, constipation, or more.