Beer Info FAQ

Why Does Guinness Make You Poo?

Guinness is a popular Irish stout beer known for its distinct flavor and creamy texture. However, some individuals have noticed that consuming Guinness can have an impact on their bowel movements. In this article, we will explore the factors that contribute to the digestive effects of Guinness and shed light on why it may make you poo.

Overview of Guinness and Its Ingredients

Guinness is brewed using a combination of water, barley, hops, and yeast. What sets Guinness apart from other beers is its unique brewing process, which involves the use of roasted barley. This roasted barley gives Guinness its dark color and rich flavor profile.

The Role of Fiber in Guinness

One of the reasons why Guinness may affect your bowel movements is its relatively high fiber content. Fiber is an essential component of a healthy diet and plays a crucial role in maintaining regular bowel movements. Guinness contains soluble fiber derived from the barley used in its brewing process. This fiber can add bulk to your stool and promote healthy digestion.

The Impact of Alcohol on Digestion

Alcohol, including the alcohol content in Guinness, can also have an impact on your digestive system. Alcohol is a diuretic, meaning it increases urine production and can lead to dehydration. Dehydration can affect the consistency of your stool and potentially contribute to looser bowel movements.

Carbonation and Bowel Movements

Another factor to consider is the carbonation present in Guinness. Carbonated beverages, including beer, can cause gas and bloating in some individuals. This increased gas production can stimulate bowel movements and lead to more frequent trips to the bathroom.


In conclusion, several factors contribute to the digestive effects of Guinness beer. Its fiber content, alcohol content, and carbonation can all play a role in affecting bowel movements. It's important to note that individual experiences may vary, and not everyone will have the same reaction to consuming Guinness. If you have concerns about the impact of Guinness or any other food or beverage on your digestive health, it's always best to consult with a healthcare professional.

Frequently Asked Questions

Q: Does Guinness have a laxative effect? A: While Guinness may have a mild laxative effect on some individuals due to its fiber content and alcohol, it is not considered a strong laxative.

Q: Can drinking Guinness cause diarrhea? A: Drinking Guinness in moderation is unlikely to cause diarrhea. However, excessive alcohol consumption can irritate the digestive system and lead to loose stools.

Q: Is Guinness good for digestion? A: The fiber content in Guinness can contribute to healthy digestion for some individuals. However, it's important to consume alcohol in moderation and maintain a balanced diet for optimal digestive health.

Q: Can Guinness help with constipation? A: The fiber content in Guinness may help add bulk to the stool and alleviate constipation in some cases. However, it's essential to address the underlying causes of constipation and consult with a healthcare professional for personalized advice.

Q: Are there any health risks associated with drinking Guinness? A: Like any alcoholic beverage, excessive consumption of Guinness can have negative health effects. It's important to drink responsibly and be aware of your alcohol intake to avoid potential risks to your health.

Remember to always drink alcohol responsibly and in moderation. If you have any concerns about your digestive health or the effects of Guinness on your body, it's best to consult with a healthcare professional for personalized advice.