Does eating sourdough bread daily for 8 weeks improve gut health and wellbeing compared to white bread?

The effect of daily sourdough bread consumption on gastrointestinal symptoms, gut microbiota composition, and metabolic markers in healthy adults with mild to moderate gut discomfort compared to white bread: a randomised parallel-group dietary intervention trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN44284096

Enrollment

Registered

2026-03-19

Start date

2026-06-01

Completion date

Unknown

Last updated

2026-05-04

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Mild to moderate gastrointestinal discomfort in healthy adults Digestive System

Interventions

Participants will be randomly assigned to one of two parallel groups: daily consumption of sourdough bread (intervention arm) or white bread (control arm), at a dose of approximately 180 g per day, fo

Eligibility

Sex/Gender

All

Age

20 Years to 45 Years

Inclusion criteria

Inclusion criteria: 1. Aged 20–45 years 2. Self-reported mild to moderate gastrointestinal discomfort or transit issues, as assessed by screening questionnaire

Exclusion criteria

Exclusion criteria: 1. Diagnosed irritable bowel syndrome (IBS) 2. Diagnosed inflammatory bowel disease (IBD) 3. Coeliac disease or gluten/wheat intolerance or allergy

Countries

Ireland

Contacts

Public ContactEmma Feeney

emma.feeney@ucd.ie+353 (0)17162247

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: May 7, 2026