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How Anxiety Causes Yellow StoolAnxiety may contribute to yellow stool color in a variety of ways. What yellow stool traditionally means is that food passed through your digestive tract too quickly. Yellow is often the color of diarrhea, because diarrhea often (although not always) implies that the digestive system was "too quick" in passing the food through.The yellow color itself is due to a combination of bilirubin (a chemical inside the body created by the liver) and fat. Undigested fat and bilirubin that hasn't been adequately altered through the natural digestive process both increase the risk of feces becoming a type of yellow or yellowish green. Bilirubin colors your urine and your bruises as well, and is responsible for the brown pigment in stool – but only after it is converted to stercoblin – a process that doesn't occur fully if food passes through the digestive system too quickly.Numerous studies have shown that those with anxiety and stress suffer from faster intestinal transit.The most likely cause is the distribution of fluids during anxiety, and the activation of the fight or flight response. It's likely that stress also changes metabolism and hormone balance in a way that makes the intensities function erratically. In addition, studies have shown that the part of the brain that controls digestion slows down during anxiety, so that mental resources can be used elsewhere.All of these problems will speed up digestion and possibly lead to yellow stool.