Oiliness in Toilet Water After Bowel Movements - Gastroenterology and Hepatology

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There is a slight oily sheen in the toilet after bowel movements?


Hello Doctor, I recently noticed a small area on the surface of the toilet water that has a slight oily sheen after bowel movements.
Sometimes my stools are well-formed, while other times they are loose, but upon close observation, there is always a small amount of oil present.
My daily diet is not particularly greasy, but I do consume some black sesame seeds every day.
What could this issue be? Thank you.

Xiao An, 40~49 year old female. Ask Date: 2020/09/07

Dr. Chen Shidian reply Gastroenterology and Hepatology


If there has not been a continuous presence of diarrhea/oily stools/weight loss for several months, and only a small amount of floating oil is present without causing harm, it can be monitored further.

Reply Date: 2020/09/07

More Info


The presence of oiliness on the surface of toilet water after bowel movements can be concerning, but it is often related to dietary habits and digestive health. In your case, the observation of a slight oily sheen on the water, along with occasional variations in stool consistency, suggests that there may be several factors at play.

Firstly, the oiliness you are noticing could be a result of undigested fats in your diet. Even if you do not consider your diet to be particularly oily, certain foods can contribute to this phenomenon. For instance, foods high in fat, such as nuts (including black sesame seeds), oils, and dairy products, can lead to the presence of fat in your stool if they are not fully digested. The body requires bile, produced by the liver, to emulsify fats for proper digestion. If there is any disruption in bile production or fat digestion, it can result in oily stools.

Additionally, the consistency of your stool can also play a role. If you experience loose or watery stools, this can lead to a higher likelihood of oil floating on the surface of the toilet water. Loose stools can be caused by a variety of factors, including dietary changes, gastrointestinal infections, or conditions such as irritable bowel syndrome (IBS). If your stools are consistently loose or if you experience other symptoms such as abdominal pain, bloating, or changes in appetite, it may be worth consulting a healthcare professional for further evaluation.

Another important consideration is the possibility of malabsorption syndromes. Conditions such as celiac disease, Crohn's disease, or pancreatic insufficiency can impair the body's ability to absorb nutrients, including fats. This can lead to steatorrhea, which is characterized by fatty, foul-smelling stools that may float and leave an oily residue in the toilet. If you have a history of gastrointestinal issues or if you notice other concerning symptoms, it is advisable to seek medical attention.

In your case, since you mentioned that your diet includes black sesame seeds, it's worth noting that while they are nutritious, they also contain fats. If consumed in large quantities, they could contribute to the oily appearance of your stool. However, if your overall diet is balanced and you are not experiencing any significant gastrointestinal symptoms, the oiliness may not be a cause for alarm.

To address your concerns, consider the following steps:
1. Monitor Your Diet: Keep track of what you eat and note any changes in your bowel movements. Reducing the intake of high-fat foods may help determine if they are contributing to the oiliness.

2. Stay Hydrated: Ensure you are drinking enough water, as hydration can aid in digestion and stool formation.

3. Consult a Healthcare Professional: If the oily appearance persists, or if you experience other symptoms such as abdominal pain, weight loss, or changes in appetite, it is important to consult a healthcare provider. They may recommend tests to evaluate your digestive health and rule out any underlying conditions.

4. Consider Fiber Intake: Increasing dietary fiber can help regulate bowel movements and improve stool consistency. Foods high in fiber include fruits, vegetables, whole grains, and legumes.

In conclusion, while the presence of oiliness in toilet water can be related to dietary habits, it is essential to pay attention to other symptoms and consult a healthcare professional if needed. Maintaining a balanced diet and monitoring your digestive health can help you manage this issue effectively.

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