Does Coffee Make Your Poop Smell? The Surprising Truth

By Last Updated: May 4th, 20246.6 min readViews: 2667

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About the Author: Daryl Stubbs
Daryl Stubbs
Daryl Stubbs is a multi-disciplinary health professional, combining his roles as an award-winning athletic therapist, registered massage therapist, and certified holistic nutritionist to offer a comprehensive approach to wellness. Graduating in 2013, Daryl has been recognized as the best massage therapy clinic in Victoria for 2022 and 2023 and has received national athletic therapy awards. He is known for his holistic approach to health, focusing on treating the body as a whole. Clients appreciate his focus on the science of probiotics, supplements, gut health, and the human body, ensuring a well-informed and evidence-based approach to their wellness journey.
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Coffee is a popular beverage that is enjoyed by people all over the world. It is known to provide a boost of energy and improve mental alertness. However, some people have noticed that after drinking coffee, their poop smells different. This has led to the question of whether or not coffee can make your poop smell.

While there is no definitive answer to this question, it is believed that coffee can indeed affect the odor of your poop. This is because coffee contains compounds that can alter the composition of your gut bacteria, which in turn can affect the smell of your poop. Additionally, coffee can also speed up bowel movements, which can result in less time for the body to break down waste products and therefore lead to a stronger odor. However, it is important to note that not everyone will experience changes in the smell of their poop after drinking coffee, as individual factors such as diet and overall health can also play a role.

Key Takeaways: Coffee can make your poop smell more acidic due to the increase in stomach acid production. However, drinking coffee can also help eliminate bad bacteria that leads to foul-smelling fecal matter.

While high intakes of coffee can cause dehydration in your body, leading to poop that smells like coffee. Overall, the relationship between coffee and poop smell is complex and can vary depending on several factors.

How Coffee Affects Digestion

When it comes to digestion, coffee has both positive and negative effects. While some people may experience improved digestion after drinking coffee, others may experience discomfort or even diarrhea. Understanding how coffee affects digestion can help you determine if it’s the right beverage for you.

The Role of Caffeine

Caffeine is a natural stimulant that can affect the digestive system in several ways. It can stimulate the muscles in the digestive tract, which can help move food through the system more quickly. This can be beneficial for people who struggle with constipation. However, caffeine can also stimulate the production of stomach acid, which can lead to heartburn or acid reflux.

The Role of Chlorogenic Acid

Chlorogenic acid is a compound found in coffee that can also affect digestion. It has been shown to slow down the absorption of carbohydrates in the small intestine, which can help regulate blood sugar levels. However, it can also cause bloating and gas, particularly in people who are sensitive to it.

Overall, the effects of coffee on digestion can vary from person to person. While some people may experience improved digestion and regularity, others may experience discomfort or even diarrhea. It’s important to pay attention to how your body reacts to coffee and make adjustments accordingly.

Here are a few tips to help minimize any negative effects of coffee on digestion:

  • Drink coffee in moderation
  • Choose high-quality, organic coffee beans
  • Avoid adding sugar or artificial sweeteners to your coffee
  • Consider drinking decaf or switching to herbal tea if you experience discomfort after drinking coffee.

The Connection Between Coffee and Fecal Odor

Coffee is a widely consumed beverage that is known to have a stimulating effect on the digestive system. It is also known to have an impact on the odor of feces. In this section, we will explore the connection between coffee and fecal odor.

The Science Behind Fecal Odor

Fecal odor is primarily caused by the presence of bacteria in the colon. These bacteria break down the food we eat and produce gases such as methane and hydrogen sulfide. These gases are responsible for the characteristic odor of feces.

How Coffee Affects Fecal Odor

Coffee contains compounds that can affect the odor of feces. One of these compounds is caffeine. Caffeine is a stimulant that can increase the activity of the digestive system. This increased activity can cause food to move more quickly through the digestive system, reducing the amount of time that bacteria have to produce gases.

Another compound found in coffee is chlorogenic acid. Chlorogenic acid is a type of antioxidant that is found in coffee beans. It has been shown to have an antibacterial effect, which can reduce the number of bacteria in the colon. This reduction in bacteria can lead to a reduction in the odor of feces.

However, it is important to note that the impact of coffee on fecal odor can vary from person to person. Factors such as diet, hydration, and overall health can all have an impact on the odor of feces.

In conclusion, coffee can have an impact on the odor of feces due to its effect on the digestive system and the antibacterial properties of compounds found in coffee. However, the impact can vary from person to person, and other factors can also play a role in the odor of feces.

Other Factors That Affect Fecal Odor

There are several factors that can affect the odor of feces, besides coffee. Here are some of the most common:


The food you eat can have a significant impact on the smell of your poop. Certain foods, such as garlic, onions, and spices, can cause your poop to smell stronger and more pungent. On the other hand, foods high in fiber, such as fruits and vegetables, can help regulate digestion and reduce the odor of feces.

Gut Bacteria

The bacteria in your gut play a crucial role in digestion and can also affect the smell of your poop. When the balance of bacteria in your gut is disrupted, it can lead to an overgrowth of certain types of bacteria, which can cause foul-smelling poop. Probiotics, which are found in foods like yogurt and kefir, can help restore the balance of bacteria in your gut and reduce the odor of feces.


Certain medications can also affect the smell of your poop. Antibiotics, for example, can disrupt the balance of bacteria in your gut and cause foul-smelling poop. Iron supplements can also cause your poop to smell stronger and darker in color.

Health Conditions

Several health conditions can also cause foul-smelling poop. These include:

  • Celiac disease: A condition in which the body cannot tolerate gluten, a protein found in wheat, rye, and barley.
  • Crohn’s disease: A chronic inflammatory bowel disease that can cause diarrhea, abdominal pain, and fatigue.
  • Ulcerative colitis: A chronic inflammatory bowel disease that can cause diarrhea, abdominal pain, and rectal bleeding.
  • Pancreatitis: Inflammation of the pancreas, which can cause abdominal pain, nausea, and vomiting.

If you notice a sudden change in the odor of your poop, it’s important to talk to your doctor to rule out any underlying health conditions.

Tips for Reducing Fecal Odor

Limiting Coffee Intake

Although coffee is a popular beverage, it can lead to smelly stools due to its high caffeine content. Limiting coffee intake is one way to reduce fecal odor. People who drink coffee regularly may experience withdrawal symptoms if they suddenly stop drinking it. Therefore, it is recommended to gradually reduce coffee intake rather than quitting it altogether.

Drinking More Water

Drinking more water is another way to reduce fecal odor. When the body is dehydrated, the urine becomes concentrated and can have a strong odor. Similarly, dehydration can also affect the digestive system and lead to smelly stools. Drinking plenty of water can help to flush out toxins from the body and reduce fecal odor.

Eating a Balanced Diet

Eating a balanced diet is crucial for maintaining good digestive health and reducing fecal odor. Foods high in sulfur, such as onions, garlic, and cruciferous vegetables, can cause smelly stools. Therefore, it is recommended to limit the intake of these foods. Additionally, eating foods rich in fiber can help to promote regular bowel movements and reduce constipation, which can lead to smelly stools.

In conclusion, reducing fecal odor requires a combination of lifestyle changes, such as limiting coffee intake, drinking more water, and eating a balanced diet. By following these tips, people can improve their digestive health and reduce the unpleasant odor of their stools.

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