The goal of this clinical trial is to demonstrate that a fiber-enriched diet (with a high proportion of inulin and pectin) combined with standard care can reduce intestinal permeability in patients with alcohol use disorder (AUD) aged between 19 and 65.

The hypothesis of our study is that a diet rich in different dietary fibers (mainly inulin and pectin), by modifying the gut microbiota and its metabolites, will induce a decrease in intestinal permeability, restore the composition of the gut microbiota and its metabolites, and further improve abstinence, levels of craving and anxiety, inflammation, steatosis, and hepatic fibrosis in patients with alcohol use disorder.

The study consists of two parallel groups (a group eating fiber-rich snacks every day for 28 days (in addition to their usual care) versus a group not eating any snacks).

Participants will be required to provide stool, blood, and saliva samples, and complete questionnaires.

Our study proposes testing a new therapeutic target for alcohol addiction: the gut microbiota, which could have a major impact on the prognosis for these patients, or for other addictive behaviors. Dietary fiber can modify alcohol-related intestinal dysbiosis and improve alcohol-induced changes in the intestinal barrier. Given the potential life-threatening nature of alcohol dependence, our study is the first to evaluate the effectiveness of a high-fiber diet in reducing alcohol consumption, increasing alcohol abstinence rates, and improving addictive behavior, cravings, and anxiety and depression symptoms in patients with severe alcohol addiction. The secondary objectives will allow us to study certain mechanisms involved in these effects, with a particular focus on the gut-brain axis. Given the difficulty of managing this chronic condition, if our results are positive, dietary fiber and dietary modulation could become an additional therapeutic option for alcohol withdrawal, improving prognosis and directly benefiting these patients. Furthermore, compared to other treatments used for alcohol addiction, fiber, through its mode of action, could also improve alcohol-related complications.

Although there is no official maximum intake for dietary fiber, excessive consumption, especially when the amount is increased dramatically over a short period of time, can cause minor, non-severe side effects such as gas and bloating. However, our intervention will not exceed the maximum recommended fiber intake recommended by scientific societies, which will reduce the risk of adverse effects. The constraints for patients are minimal and mainly involve eating the bite-sized pieces in addition to their usual meals and completing specific questionnaires to determine their impact on diet, addictive behaviors, and quality of life.

Subjects participating in the study will receive fiber-enriched food bite-sized pieces (16 bite-sized pieces/day for a total of 16 g of fiber: 8 g of inulin and 8 g of pectin) developed by Carembouche every day for 28 days. To increase compliance, different flavors will be offered (citrus, coffee, vanilla, chocolate) for the patient to choose from at the time of inclusion. The bite-sized pieces will be packaged in batches, one package per day, to be stored at room temperature. The bite-sized pieces will be supplied by Carembouche and stored in the department in a closed cupboard, away from light and in accordance with the manufacturer's instructions. Patients will receive the bite-sized pieces during their hospital stay and will return home with the quantity needed for the following 7 days. During the visit on day 14, patients will receive the quantity needed for the remaining 14 days of the protocol. The treatment includes a phase of gradual dose increase with 4 bite-sized pieces on day 1, 8 on day 2, 12 on day 3, and 16 from day 4 until the end of the study. During this adaptation period, patients will be able to choose flavors according to their taste preferences.

Inclusion Criteria:

• Women or men,
• aged >18 and ≤ 65,
• French-speaking,
• active alcohol users (as defined by the criteria in the Diagnostic and Statistical Manual of Mental Disorders, 5th edition, DSM-5)
• who agree to be hospitalized for alcohol withdrawal for a period of 7 days
• Affiliated with or eligible for social security.
• Negative pregnancy test (for patients of childbearing age)

Exclusion Criteria:

• any other addictive disorder (except tobacco),
• inflammatory bowel disease or any other chronic inflammatory disease,
• current cancer,
• metabolic diseases such as obesity (BMI ≥ 30 kg/m²) kg/m2) or a history of bariatric surgery,
• severe cognitive impairment (MMSE < 24),
• psychiatric comorbidities including suicide risk,
• cirrhosis or significant fibrosis (≥F2) defined by a Fibroscan value >7.6 kPa,
• pregnancy or breastfeeding,
• taking antibiotics, probiotics, or prebiotics in the 2 months prior to inclusion,
• taking non-steroidal anti-inflammatory drugs or glucocorticoids in the month prior to inclusion.
• taking baclofen, disulfiram, naltrexone, or acamprosate.
• Participation in another interventional study involving human subjects or being in the exclusion period following a previous study involving human subjects, if applicable
• Patients under AME
• Patients under guardianship, trusteeship, or any other legal protection measure