Imagine feeling intoxicated without having consumed a single drop of alcohol. While it may sound unbelievable, this is a real and rare medical condition called Auto-Brewery Syndrome (ABS) or Gut Fermentation Syndrome.
In people with this rare disorder, the digestive system produces ethanol, a type of alcohol, from the food they eat, leading to symptoms similar to alcohol intoxication. This syndrome causes alcohol intoxication in people who have not consumed any alcohol. This happens when microbes in the intestines ferment the sugars that were eaten to produce ethanol — It is like having a brewery in the gut. Your own gut is essentially brewing alcohol, getting you intoxicated from the inside out. It is a rare but real medical condition and can cause a person to act drunk even without having any alcohol to drink
In a nutshell, auto-brewery syndrome reflects an unhealthy, abnormal gut.
How Does Auto-Brewery Syndrome Happen?
Normally, the gut or the digestive tract contains healthy microorganisms that help digest food. Rarely, but it does happen, an overgrowth of certain yeasts or fungi (brewer's yeast) occurs. These organisms ferment sugars and starches from food eaten to produce ethanol (alcohol). The alcohol is absorbed into the bloodstream, and levels may get high enough to produce symptoms of intoxication.
What are the Causes of ABS?
- Frequent or long-term use of antibiotics
- Gastrointestinal diseases that slow down the movement (motility) of the GI tract
- High blood sugar provides more fuel for these microbes to ferment
- Weakened immune system due to medical conditions or medications
What are the Symptoms of ABS?
The hallmark of auto brewery syndrome is sudden onset of intoxication symptoms without drinking alcohol. You Might Experience
Mental/Cognitive Symptoms:
- Slurred speech
- Confusion or disorientation or difficulty thinking clearly
- Poor judgment
- Mood changes (irritability, aggression, or emotional swings)
- Memory problems
- Difficulty concentrating
Physical Symptoms:
- Dizziness or vertigo
- Loss of balance or coordination (ataxia)
- Nausea and vomiting
- Headaches
- Fatigue or drowsiness
- Weakness
Behavioural Signs which others notice:
- Stumbling or unsteady gait
- Slurred speech
- Inappropriate behaviour
- Personality changes
- Difficulty with fine motor tasks like writing, buttoning clothes
Diagnosis of ABS
A healthcare provider might suspect auto-brewery syndrome if you have symptoms consistent with alcohol intoxication and an elevated blood alcohol content without having consumed alcohol.
A healthcare provider will take the history and confirm certain things through observation, discussion and testing. They will ask about eating and drinking habits, observe symptoms and test them repeatedly over a period of time
Diagnosis and Tests might include:
- A detailed medical history.
- Physical exam and other routine diagnostics
- Blood tests or breathalyser tests for blood alcohol content (BAC)
- Oral glucose tolerance test to observe your response to carbohydrates
- Hydrogen breath test to identify bacterial overgrowth
- Stool test and culture to identify fungal overgrowth
- Endoscopy to take a fluid sample from your GI tract
Treatment of Auto Brewery Syndrome
The most important treatment is dietary modification/management
Foods to Avoid or Minimize:
- Refined sugars (candy, desserts, sweetened beverages)
- White bread and white rice
- Foods high in simple carbohydrates
- Fruits high in sugar (though whole fruits with fibre are often better tolerated than fruit juice)
- Some starchy vegetables (potatoes, corn)
Foods to incorporate:
- Vegetables (non-starchy: leafy greens, broccoli, peppers, cucumbers)
- Whole grains (brown rice, whole wheat, oats) in moderate amounts
- Lean proteins (chicken, fish, eggs, legumes)
- Healthy fats (olive oil, nuts, avocado)
- Foods with resistant starch (cooled cooked potatoes, unripe bananas)
Medication
- Antifungal Medications
- Antibiotics
- Probiotics
- Prebiotics
Managing Auto Brewery Syndrome: Practical Strategies
Immediate Management during Episodes:
- Stop eating new carbohydrates to ferment
- Rest in a safe location
- Avoid driving or operating machinery
- Stay hydrated
- Wait 2-4 hours for symptoms to resolve naturally as fermentation decreases
Care at STAR Hospitals
Auto Brewery Syndrome is an unusual condition, but it is real, diagnosable and treatable. Symptoms can closely mimic alcohol intoxication despite complete abstinence from alcohol. Getting diagnosed requires finding a doctor familiar with the condition and requesting blood alcohol testing during an episode. If you suspect you have auto brewery syndrome, do not accept dismissive explanations or alcohol-related accusations. Seek proper medical evaluation.
At STAR Hospitals, our expert gastroenterology team provides excellent medical care and solutions to conditions such as ABS. With advanced diagnostic techniques and treatment options under one roof, along with an experienced and empathetic team of healthcare professionals, we ensure that you feel confident and comfortable and recover fast. Book an appointment with us today to know more.
