No Guts No Glory Probiotics

Inclusion Criteria: 1. About to start, or having started within the last 8 weeks, antipsychotic treatment with olanzapine, quetiapine\*, clozapine or risperidone for treating psychosis 2. Aged between 18 - 65 3. No exposure to these four antipsychotic medications for longer than one week continuously in the last 6 months (except starting the treatment with the current medication 8 weeks prior to the inclusion) 4. The participant understands the study and is able to provide written informed consent. * Quetiapine prescribed in a low dose for use as a sleep aid does not apply Exclusion Criteria: 1. Critically ill patients (e.g. ICU), diagnosed comorbid eating disorders, chronic GI-disorders, disorders of the liver or pancreas, pre-existing diagnosed diabetes mellitus or metabolic syndrome 2. Current use of medications known to target metabolism or weight (e.g, diabetes medication and GLP-1 agonists, proton pump inhibitors and diuretics/beta blockers) or use of antibiotics or probiotics (such as Yakult, Activia, or other probiotic supplements containing ≥10⁹ CFUs) in the past 4 weeks 3. Pregnancy or breastfeeding 4. Inability to follow the intervention or other conditions that according to the investigator might interfere with the evaluation of the study objectives as judged by the treating physician