Auto-brewery syndrome or gut fermentation syndrome is a condition in which ethanol is produced through endogenous fermentation in the gastrointestinal (GI) system. Spontaneous ethanol production occurs via a different metabolic pathway. Auto-brewery syndrome occurs in patients with alcohol intoxication after they ingest carbohydrate-rich meals.
Saccharomyces cerevisiae, a type of yeast, is identified as the pathogen. Endogenous fermentation or auto-brewery syndrome has been used as a defense against drunk driving charges although there is no literature quantifying the success rate of raising this defense. However, it is unlikely auto-brewery syndrome would cause significant levels of blood alcohol that would be high enough to induce intoxication that would produce illegal levels of blood alcohol.
A variation of the disease occurs in individuals with liver dysfunction that prevents them from excreting alcohol in a normal fashion. Patients develop signs and symptoms of auto-brewery syndrome when the yeast in the gut produces a quantity of alcohol that is too meager to induce intoxication in a normal individual but may induce signs and symptoms in individuals afflicted with auto-brewery syndrome.
Saccharomyces cerevisiae is a yeast identified as the pathogen that causes auto-brewery syndrome.
Four common yeasts (Candida albicans, Candida tropicalis, Saccharomyces cerevisiae, and Torulopsis glabrata) were combined with infant formulas. Ethanol production was measured after 24 and 48 hours. The quantities of ethanol produced suggest an explanation for patients exhibiting auto-brewery syndrome.
This is a rare condition. The disease has been identified in both adults and children.
Saccharomyces cerevisiae has been identified as the cause of this condition. Although yeasts such as Candida albicans may produce ethanol in-vitro, whether this happens in healthy subjects has not been established. Determinations of endogenous ethanol have been made, and in rare instances, a high ethanol concentration (greater than 80 mg/dl) has been identified. In these rare individuals, endogenous ethanol appeared to have been produced after consumption of a high carbohydrate diet.
A genetic polymorphism that results in reduced activity of enzymes involved in the hepatic metabolism of ethanol and a first-pass metabolism might explain the ethnic differences in rates of endogenous ethanol production and clearance. Reports of abnormally high concentrations of ethanol in body fluids from ostensibly healthy subjects suffer from deficiencies in study design or use non-specific unreliable research methods.
With reliable gas chromatographic methods of analysis, the concentrations of endogenous ethanol in the peripheral venous blood of healthy patients, as well as those suffering from metabolic disorders such as diabetes, cirrhosis, or hepatitis ranged from 0 to 0.08 mg/dl. These concentrations are too low to be significant. The notion that intoxication of a motorist was a direct result of endogenously produced ethanol has as yet not been scientifically demonstrated.
Auto-brewery syndrome has significant effects on life. The patient may experience side effects of belching, chronic fatigue syndrome, dizziness, dry mouth, disorientation, hangovers, and irritable bowel syndrome. The chronic fatigue syndrome can result in health problems such as anxiety, depression, and poor productivity. The random state of intoxication can result in difficulties, and the obscurity of the condition may make it difficult to diagnose and find a successful treatment.
The patient's dietary intake should be carefully evaluated.
Auto-brewery syndrome is possible in any patient with chronic obstruction or hypomotility that presents with elevated serum ethanol levels and high carbohydrate intake and no history of alcohol consumption. Because of the production of significant alcohol levels, people can test over the legal driving limit without having consumed any alcohol.
The possibility of endogenous ethanol fermentation should be considered in patients with SBS and included in the differential diagnosis list for D-lactic acidosis.
The treatment of auto-brewery syndrome is a modification in the diet requiring high protein and low carbohydrates.
Sugar is fermented into alcohol, a diet that lowers sugars will decrease the alcohol fermented from the gastrointestinal tract. Anything that causes an imbalance between harmful and beneficial bacteria can potentially increase fermentation in the gut. This may include antibiotics and the overindulgence in sugars and carbohydrates.
Lower the risk of gut fermentation syndrome by avoiding carbohydrates and taking probiotics that increase normal bacteria in the gastrointestinal tract.
Use of antibiotics, carbohydrate control, and antifungal therapy have all been reported as successful treatments. Clinical consideration and diagnosis of auto-brewery syndrome should be made with caution, considering the lack of validated scientific evidence and a mechanism linking endogenous ethanol production to peripheral blood ethanol.
Auto-brewery syndrome should be considered in the differential diagnosis of patients that are not consuming alcohol and yet exhibit the signs and symptoms of alcohol consumption; particularly if they are also consuming a high carbohydrate diet.
With antibiotics and diet modification, most symptoms resolve.
Auto-brewery syndrome is known to have a profound effect on patients and families. In many cases, it is mistaken for alcohol consumption. This can be problematic when a victim of the disease denies alcohol intake but has the signs, symptoms, and possible breath of someone that has been drinking alcohol.
Diet modification usually abates symptoms with antibiotic therapy and probiotics.
Consult gastroenterology and a registered dietician.
A patient should avoid a high-carbohydrate diet and eat a diet higher in proteins.
Auto-brewery syndrome (gut fermentation syndrome), although very rare, is a medical condition that may occur in patients ingesting high carbohydrate-rich meals. If there is no alcohol intake, and other more common toxicologic causes of signs and symptoms of intoxications are ruled out, this disease should be considered as a possible cause of the patient's signs and symptoms. In addition to blood alcohol, it would be appropriate to consider a drug screen.