
There are many reasons why someone's poop might smell like parmesan cheese. The most common cause of bad-smelling stool is diet, but it could also be a sign of a health condition. For example, a cheese-like smell could indicate candida overgrowth, while a strong, foul odour could be a sign of inflammatory bowel disease (IBD), an infection, or an allergy. If the smell is accompanied by unusual symptoms, it's important to consult a doctor.
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What You'll Learn
- Food intolerances, such as lactose intolerance, can cause foul-smelling poop
- Infections, such as Salmonella, can cause foul-smelling poop
- Medication, such as antibiotics, can cause foul-smelling poop
- Conditions like inflammatory bowel disease (IBD) can cause foul-smelling poop
- High levels of certain types of bacteria in the intestines can cause foul-smelling poop

Food intolerances, such as lactose intolerance, can cause foul-smelling poop
Foul-smelling poop can be caused by various factors, and food intolerances are one of the key reasons. Lactose intolerance, in particular, can lead to unpleasant-smelling stools. Lactose is a sugar found in milk and other dairy products, and it requires the enzyme lactase to break it down into smaller sugars that can be absorbed by the gut. However, people with lactose intolerance do not produce sufficient lactase, leading to issues with lactose digestion. As a result, the intestines draw water from the bloodstream to dilute the indigestible lactose, resulting in loose, foul-smelling stool.
Lactose intolerance is a common food intolerance that affects many people. In addition to causing foul-smelling poop, lactose intolerance can also lead to other digestive symptoms such as gas, bloating, and abdominal discomfort. If you suspect lactose intolerance, it is advisable to consult a healthcare professional for proper diagnosis and guidance. They may recommend dietary changes, such as reducing or eliminating dairy products, or suggest the use of lactase supplements to aid in lactose digestion.
It is important to note that food intolerances are not limited to lactose. Other types of intolerances, such as fructose or other carbohydrate intolerances, can also contribute to foul-smelling poop. Each person's digestive system is unique, and some individuals may have difficulty processing specific types of carbohydrates found in certain foods. Tracking your food intake and identifying any patterns between specific foods and unpleasant stool odors can be helpful in managing food intolerances.
Additionally, food intolerances can lead to foul-smelling poop by causing malabsorption issues in the gut. This means that the body struggles to properly absorb certain nutrients or components from the food you eat. Celiac disease, for example, is an immune reaction to gluten, a protein found in wheat, barley, and rye. This reaction damages the small intestine lining, leading to difficulty absorbing vitamins and nutrients, which can result in foul-smelling stool. Identifying and treating the underlying food intolerance can help address this issue.
While food intolerances can be a common cause of foul-smelling poop, it is always advisable to consult a healthcare professional if the issue persists or is accompanied by other concerning symptoms. They can help determine the root cause and provide personalized advice and treatment options to improve your digestive health and reduce unpleasant stool odors.
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Infections, such as Salmonella, can cause foul-smelling poop
Foul-smelling stools can be caused by dietary habits, certain medications, or underlying health conditions. While it is usually caused by the foods people eat, it can sometimes indicate a more serious health problem, such as an infection, an allergy, or colitis.
In addition to Salmonella, other bacterial infections that can cause foul-smelling stools include Clostridium difficile (C. diff), Giardiasis, E. coli, and gastroenteritis. These infections can affect digestion and lead to diarrhea, abdominal cramps, and other gastrointestinal symptoms.
Foul-smelling stools can also be caused by viral infections, parasitic infections, or antibiotic use. Viral and parasitic infections can disrupt digestion and cause diarrhea, similar to bacterial infections. Antibiotics can destroy good digestive bacteria, allowing harmful bacteria to multiply and cause infections that lead to temporary foul-smelling stools.
It is important to note that foul-smelling stools can be a sign of a serious health problem. If the condition persists or is accompanied by other symptoms, it is recommended to consult a healthcare professional for proper diagnosis and treatment.
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Medication, such as antibiotics, can cause foul-smelling poop
Foul-smelling poop can be a sign of malabsorption, where the body struggles to absorb certain nutrients from food properly. This can be caused by conditions such as lactose intolerance or celiac disease. In lactose intolerance, the body does not produce enough of the enzyme lactase to break down lactose, a sugar found in dairy products. As a result, the intestines draw water from the bloodstream to dilute the lactose, leading to loose, foul-smelling stool. Celiac disease, on the other hand, is an immune reaction to gluten, a protein found in wheat, barley, and rye. This can lead to inflammation and damage to the small intestine, causing difficulty in absorbing nutrients and resulting in fatty, unpleasant-smelling stool.
In some cases, foul-smelling poop can be a symptom of an infection or underlying health condition. Infections that affect the intestines, such as bacterial or parasitic infections, can cause a change in the smell of stool. For example, Salmonella and Giardiasis are both associated with foul-smelling diarrhoea. Additionally, viral infections like viral gastroenteritis (stomach flu) can also cause foul-smelling stool.
Foul-smelling poop can also be caused by certain dietary habits or food intolerances. Foods rich in sulfates, such as eggs, cabbage, broccoli, and cauliflower, can lead to sulphurous-smelling stool that resembles the odour of rotten eggs. Food intolerances, such as lactose intolerance or gluten intolerance, can also contribute to foul-smelling stool. It is important to note that while dietary habits can play a role, foul-smelling poop that persists or is accompanied by other symptoms may indicate a more serious health concern.
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Conditions like inflammatory bowel disease (IBD) can cause foul-smelling poop
Foul-smelling poop can be a reaction to certain foods, such as broccoli and eggs, or an infection in the digestive tract. However, it can also indicate a more serious underlying health condition, such as inflammatory bowel disease (IBD). IBD is an umbrella term for conditions that cause inflammation in the lining of the large intestine, including ulcerative colitis and Crohn's disease.
Ulcerative colitis is a chronic type of IBD that causes inflammation in the lining of the large intestine, including the colon and rectum. This inflammation disrupts the normal function of the large intestine, leading to changes in the texture, colour, and smell of poop. Ulcerative colitis can cause poop to become watery, loose, and mucus-filled, often accompanied by urgency and abdominal pain. The presence of blood in the stool is a common symptom, indicating that the inflammation is not being adequately treated.
Crohn's disease, another type of IBD, can also cause foul-smelling poop. It primarily affects the small intestine, leading to dark-coloured and foul-smelling stools, a condition known as melena. Blood in the stool can also be a symptom of Crohn's disease, although it may appear as shiny, black stool resembling used motor oil due to the presence of blood higher up in the digestive tract.
If you are experiencing foul-smelling poop and other unusual symptoms, it is important to consult a doctor. They can help diagnose any underlying health conditions and recommend appropriate treatments to manage your symptoms effectively.
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High levels of certain types of bacteria in the intestines can cause foul-smelling poop
Foul-smelling poop can be caused by various factors, and it is often linked to the food we eat and the bacteria in our intestines. While it is normal for poop to have an unpleasant odour, a sudden change or an unusually strong smell may indicate an underlying issue.
For example, a high-protein or high-fat diet, rich in meats and cheeses, can increase the production of smelly gases in the gut, resulting in more pungent-smelling poop. Additionally, certain foods, such as sulfur-rich foods like meat, eggs, dairy, and cruciferous vegetables, can be harder for the body to digest, leading to increased odour.
Furthermore, taking antibiotics can disrupt the balance of gut bacteria, leading to a temporary increase in bad bacteria and resulting in smelly stool. In some cases, antibiotics can destroy a significant amount of good bacteria, allowing harmful bacteria to multiply and cause infections, further contributing to foul-smelling poop.
Certain health conditions can also impact the balance of gut bacteria and cause foul-smelling stool. For instance, people with inflammatory bowel diseases (IBD), such as Crohn's disease and ulcerative colitis, often have different types of bacteria in their guts, leading to unusual-smelling stool. Celiac disease, irritable bowel syndrome (IBS), and cystic fibrosis are other examples of conditions that can affect gut bacteria and stool odour.
It is important to note that while diet and gut bacteria play a significant role in stool odour, other factors can also contribute. The time it takes for food to move through the colon, underlying infections, and the presence of blood or pus in the stool can all influence its smell. If unusual symptoms accompany a persistent foul odour, it is recommended to consult a doctor for further evaluation.
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Frequently asked questions
The most common cause of bad-smelling stool is diet. Sulfur-rich foods such as meat, cheese, and cruciferous vegetables are harder to digest, which may be the cause of the parmesan cheese smell.
If the foul smell is consistent and accompanied by other symptoms such as unusual stool color, blood or pus in the stool, or a fever, it is best to consult a doctor.
Foul-smelling poop could be due to an imbalance of good and bad bacteria in the gut, which can be caused by taking antibiotics or certain infections.
To reduce constipation, it is recommended to increase water intake and consume easily digestible and high-fiber foods.
Yes, inflammatory bowel diseases (IBD) such as Crohn's disease and ulcerative colitis can cause unusual-smelling poop due to differences in metabolism, inflammation, or types of bacteria in the gut.

























