The discovery that human beings may endogenously produce ethanol is not new and dates back at the end of the 19th century; recently, however, it has become clear that through the proliferation of gut microorganisms that produce ethanol from sugars or other substrates, blood alcohol level may be greater than 0, despite Homo sapiens sapiens lacking the enzymatic pathways to produce it. Very rarely this can lead to symptoms and/or to a disease, named gut fermentation syndrome or auto-brewery syndrome (ABS). The list of microorganisms (mostly bacteria and fungi) is very long and contains almost 100 different strains, and many metabolic pathways are involved. Endogenous ethanol production is a neglected entity, but it may be suspected in patients in whom ethanol consumption may be firmly excluded. Nevertheless, due to the growing prevalence of NAFLD (now renamed as MAFLD) worldwide, an ethanol-producing microorganism responsible for endogenous ethanol production such as Klebsiella pneumoniae or Saccharomices cerevisiae is increasingly sought in NAFLD patients, or in patients with metabolic diseases such as diabetes mellitus, obesity, or metabolic syndrome, at least in selected instances. In the absence of standard diagnostic and therapeutic guidelines, ABS requires a detailed patient history, including dietary habits, alcohol consumption, and gastrointestinal symptoms, and a comprehensive physical examination to detect unexplained ethanol intoxication. It has been proposed to start the diagnostic protocol with a standardized carbohydrate challenge test, followed, if positive, by the use of antifungal agents or antibiotics; indeed, fecal microbiota transplantation might be the only way to cure a patient with refractory ABS. Scientific societies should produce internationally agreed recommendations for ABS and other conditions linked to excessive endogenous ethanol production.

Background: Dyspeptic symptoms are very common in the general population, with an estimated prevalence of 14% to 41%, and the majority of patients experience symptoms without an organic cause for them (so-called functional dyspepsia). While the pathophysiology of functional dyspepsia remains elusive, the impact of functional dyspepsia on quality of life is detrimental. The treatment involves a change in lifestyle—a healthy diet and physical activity—in combination with pharmacological treatments. However, currently, there is no standard therapy for this condition, although a nutritional approach appears to be feasible and well accepted by patients. In this context, the intake of some mineral water types might be able to play an important role. Objective: The aim of the present study was to evaluate whether the regular intake of bicarbonate natural mineral water (Aqua Carpatica from source “F2 Păltiniș”) is able to positively influence the symptomatic process of dyspepsia, promoting digestion and improving the quality of life of patients. Methods: The patients enrolled in this open-label study had diagnosis of functional dyspepsia formulated in accordance with the Rome III criteria. During the 4-week study, patients had to ingest tap water at 1.5 L/day (wash-out period: 2 weeks), and in the 2-week subsequent period, they had to ingest alkaline natural mineral water at 1.5 L/day. The primary efficacy endpoint of this study includes a statistically significant improvement (p < 0.05) in the “heartburn”, “regurgitation”, and “dyspepsia” subscales and the total Reflux Disease Questionnaire’s (RDQ) score with respect to the effects of alkaline natural mineral water. As secondary endpoints, we considered statistically significant improvements (p < 0.05) in quality-of-life scores (Psychological General Well-Being Index—Short form; PGWB-S), the patient’s self-assessment of the state of efficiency of their digestion, and their sense of post-prandial fullness, as well as the use of antacids. Results: Forty-five patients were enrolled: all were Caucasian and mostly women (25, 55.6% vs. 20 men, 44.4%), and they were aged between 25 and 75 years (50.6 ± 13.5 years; mean ± SD). The results of this preliminary study show a significant improvement in functional dyspepsia symptoms—as assessed via the RDQ—and an improvement in quality of life—as assessed using the PGWB-S score—after the intake of alkaline natural mineral water. Conclusions: This preliminary study provides clinical evidence for a recommendation of alkaline natural mineral water as a symptomatic treatment of dyspepsia.

Background: The intake of mineral water for therapeutic purposes (crenotherapy) in digestive system disorders is a long-established practice, but there are still few controlled clinical studies confirming the effect of natural mineral water rich in bicarbonate. Objective: To verify whether the daily intake of Aqua 3 bicarbonate natural mineral water is able to improve digestion in a population of patients with functional dyspepsia and gastroesophageal reflux disease symptoms. Methods: Patients with a diagnosis of functional dyspepsia, formulated in accordance with the Rome IV criteria, were subjected to three 2-week intake periods: a tap water period (wash-out), a bicarbonate natural mineral water period, and an oligomineral water period. The mineral water bottles were anonymized by removing the identifying labels. The primary efficacy endpoint was the change in the Patient Assessment of Upper Gastrointestinal Disorders–Symptom Severity Index (PAGI-SYM) total score Secondary endpoints were: improvements in the PAGI-SYM subscale scores, the use of antacids, and the self-assessment of efficacy of digestion. Power analysis indicated that a minimum of 48 pairs was required and, to ensure adequate sample size, 50 subjects were enrolled Results: The PAGI-SYM total score and the six subscale scores significantly decreased after bicarbonate mineral water intake and significantly increased after oligomineral water supplementation. During the bicarbonate mineral water period, antacid use decreased significantly, with 9 patients discontinuing antacid medication (P = 0.004). During the subsequent oligomineral water period, antacid use increased, with 7 patients requiring new antacid administration, although this increase did not reach statistical significance (P = 0.070). The comparison between changes observed during the bicarbonate and oligomineral water periods was significant (P = 0.005). In addition, the score of the patients’ subjective assessment of the effectiveness of their digestion was significantly better after the intake of bicarbonate water than after intake of oligomineral water. Conclusions: In line with the evidence reported in the literature, hese preliminary findings suggest that the intake of Aqua 3 bicarbonate mineral water may alleviate dyspeptic and reflux-related symptoms and improve digestive effectiveness in patients with functional dyspepsia. Given the exploratory design, small sample size and fixed treatment sequence, these results should be interpreted as hypothesis-generating and require confirmation in adequately powered randomized controlled trials. The intake of Aqua 3 bicarbonate mineral water proved to be a simple, safe, and natural intervention capable of improving digestive symptoms in patients with functional dyspepsia and reflux-related disorders while promoting the digestive process.