The Effects of Alcohol on Digestion

A night out drinking can lead to more than just headaches and dry mouth. It can also result in those urgent trips to the bathroom, a situation known as “sakajiri.” This isn’t just a casual observation—doctors have pointed out that alcohol can irritate the gastrointestinal tract, alter gut bacteria, and hinder the intestines from absorbing water.

Dr. Rayberis Padilla, a gastroenterologist based in San Diego, explains, “Alcohol can trigger loose stools through various mechanisms.” She adds that it inhibits fluid absorption in the intestines while, paradoxically, promoting digestion. If the intestines process things too quickly, then there’s simply less time for water to be absorbed. This leads to loose or watery stools.

Dr. Jason Korenblit, a gastroenterologist in Florida, elaborates that alcohol affects every layer of the intestines as it moves through the digestive system. He notes that it can worsen heartburn, increase stomach acid production, and compromise the intestinal barrier. “Alcohol can actually make your intestines ‘leaky,’” he says. This happens because alcohol can weaken the tight junctions between intestinal cells, allowing harmful substances to breach the barrier and cause inflammation.

Interestingly, not everyone will face digestive issues after drinking. There are several factors that play a role in this. Korenblit emphasizes the importance of dose and speed: consuming more drinks in a shorter time frame can heighten irritation levels and lead to problems like leaky gut or irritable bowel syndrome. People with existing gastrointestinal conditions, such as celiac disease or chronic gastritis, may find themselves more susceptible.

It’s important to note that no alcoholic beverage is entirely “safe” for your digestive system. According to Padilla, genetics might influence your vulnerability to alcohol’s effects. “Certain genetic mutations could make you more sensitive to its impacts,” she mentions.

While some drinks are known troublemakers, Padilla points out that mixed drinks, wine, and beer often contain sugars or sugar alcohols, which can exacerbate diarrhea. Korenblit adds that carbonation in beer and soda can contribute to bloating and heartburn, while high-alcohol shots might irritate the system. For those sensitive to lactose, creamy cocktails can also be problematic. The sugars might enable easier drinking, leading to higher alcohol intake.

To help with digestion, both doctors recommend choosing low-alcohol and low-sugar drinks, and consuming them slowly. Eating beforehand, limiting alcohol intake to two drinks a day, and staying hydrated are also good practices. Mixing alcohol with caffeine can worsen intestinal issues, so caution is advised—though many experts suggest it might be best to avoid alcohol altogether. They also caution against combining alcohol with certain medications like NSAIDs, which can increase the risk of gastrointestinal distress.

Sometimes, even with these strategies, symptoms can persist. In such cases, Korenblit suggests eating easily digestible foods—things like oatmeal and bananas can help. Soups can also be beneficial as they rehydrate and restore lost fluids. Fermented foods like yogurt might work well too, but only for those who tolerate dairy.

Interestingly, doctors believe that while alcohol can upset the gut, it’s likely that most people’s microbiomes are resilient. Korenblit notes that microbiome diversity can be improved with better diet choices and by abstaining from alcohol, hinting at a potential recovery.

Lastly, the American College of Gastroenterology recommends seeking medical help if diarrhea persists for more than 48 to 72 hours or is accompanied by alarming symptoms like bloody or black stools, severe pain, fever, or dehydration.