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Introduction Autism (formally autism spectrum disorder) encompasses a group of complex neurodevelopmental conditions, characterised by differences in communication and social interactions. Co-occurring chronic gastrointestinal symptoms are common among autistic individuals and can adversely affect their quality of life. This study aims to evaluate the efficacy of oral encapsulated faecal microbiome transfer (FMT) in improving gastrointestinal symptoms and well-being among autistic adolescents and adults.Methods and analysis This double-blind, randomised, placebo-controlled trial will recruit 100 autistic adolescents and adults aged 16–45 years, who have mild to severe gastrointestinal symptoms (Gastrointestinal Symptoms Rating Scale (GSRS) score ≥2.0). We will also recruit eight healthy donors aged 18–32 years, who will undergo extensive clinical screening. Recipients will be randomised 1:1 to receive FMT or placebo, stratified by biological sex. Capsules will be administered over two consecutive days following an overnight bowel cleanse with follow-up assessments at 6, 12 and 26 weeks post-treatment. The primary outcome is GSRS score at 6 weeks. Other assessments include anthropometry, body composition, hair cortisol concentration, gut microbiome profile, urine/plasma gut-derived metabolites, plasma markers of gut inflammation/permeability and questionnaires on general well-being, sleep quality, physical activity, food diversity and treatment tolerability. Adverse events will be recorded and reviewed by an independent data monitoring committee.Ethics and dissemination Ethics approval for the study was granted by the Central Health and Disability Ethics Committee on 24 August 2021 (reference number: 21/CEN/211). Results will be published in peer-reviewed journals and presented to both scientific and consumer group audiences.Trial registration number ACTRN12622000015741.

Introduction Individuals with anorexia nervosa (AN) harbour distinct gut microbiomes compared with healthy individuals, which are sufficient to induce weight loss and anxiety-like behaviours when transplanted into germ-free mice. We hypothesise that faecal microbiome transfer (FMT) from healthy donors would help restore the gut microbiome of individuals with AN, which in turn, may aid patient recovery.Methods We aim to conduct an open-label pilot study in 20 females aged 16–32 years in Auckland, New Zealand who meet the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5) criteria for AN and have a body mass index 13–19 kg/m2. We will recruit four healthy, lean, female donors, aged 18–32 years, who will undergo extensive clinical screening prior to stool donation. Faecal microbiota will be harvested from donors and double encapsulated in delayed release, acid-resistant capsules. All participants will receive a single course of 20 FMT capsules (five from each donor) which they can choose to take over two or four consecutive days. Stool and blood samples will be collected from participants over a period of 3 months to assess their gut microbiome profile, metabolome, levels of intestinal inflammation and nutritional status. Our primary outcome is a shift in the gut microbiome composition at 3 weeks post-FMT (Bray-Curtis dissimilarity). We will also monitor participants’ body composition (whole-body dual-energy X-ray absorptiometry scans), eating disorder psychopathology, mental health and assess their views on, and tolerability of, treatment. All adverse events will be recorded and reviewed by an independent data monitoring committee.Ethics and dissemination Ethics approval was provided by the Central Health and Disability Ethics Committee (Ministry of Health, New Zealand, 21/CEN/212). Results will be published in peer-reviewed journals and presented to both scientific and consumer group audiences.Trial registration number ACTRN12621001504808.

Objectives To evaluate the efficacy and acceptability of ‘Whitu: seven ways in seven days’, a well-being application (app) for young people.Design Prospective randomised controlled trial of Whitu against waitlist control, with 45 participants in each arm.Participants 90 New Zealand young people aged 16–30 recruited via a social media advertising campaign.Setting Participants’ homes.Interventions Developed during the COVID-19 pandemic, and refined from a prototype version that was evaluated during a smaller qualitative study, ‘Whitu: seven ways in seven days’ is a well-being app that, as its name suggests, contains seven modules to help young people (1) recognise and rate emotions, (2) learn relaxation and mindfulness, (3) practice self-compassion and (4) gratitude, (5) connect with others, (6) care for their physical health and (7) engage in goal-setting. It can be completed within a week or as desired.Main outcome measures Primary outcomes were changes in well-being on the WHO 5-item Well-Being Index and Short Warwick-Edinburgh Mental Well-Being Scale. Secondary outcomes were changes in depression on the Centre for Epidemiological Studies Depression Scale, anxiety on the Generalised Anxiety Disorder 7-item Scale, self-compassion on the Self Compassion Scale-Short Form, stress on the 10-item Perceived Stress Scale, sleep on the single-item Sleep Quality Scale and user engagement on the end-user version of the Mobile Application Rating Scale and via qualitative feedback during an online survey. Outcomes were evaluated at baseline, 4 weeks (primary study endpoint) and 3 months, and analysed using linear mixed models with group, time and a group–time interaction.Results At 4 weeks, participants in the Whitu group experienced significantly higher emotional (Mean difference (md) 13.19 (3.96 to 22.42); p=0.005) and mental (md 2.44 (0.27 to 4.61); p=0.027) well-being, self-compassion (md 0.56 (0.28 to 0.83); p