Polyphenols, Prebiotics, the Gut Microbiome and Stress

Not Applicable

Completed

• Conditions: Gut Bacteria; Stress, Psychological
• Interventions: Dietary Supplement: GOS, Inulin, RS2; Dietary Supplement: prebiotics and polyphenols; Dietary Supplement: Blueberry, cranberry, green tea extract, cocoa; Dietary Supplement: Maltodextrin

• Registration Number: NCT05528575
• Lead Sponsor: University of Reading

Brief Summary

The aim of this study is to evaluate how different combinations of prebiotics and polyphenols affect the gut microbiota and perceived cognitive state. 40 volunteers will take part in this study who will be randomised into 4 different groups. One group will consume a placebo, whereas the other groups will consume prebiotics, polyphenols, or a combination of the two.

Detailed Description

* All participants will be asked to fill out a health screening questionnaire and inclusion/exclusion criteria will be reviewed for volunteer eligibility

* Valid informed consent will be obtained from the volunteer.

* Once the study begins, participants will be randomly allocated into 1 of 4 groups each assigned a different polyphenol or prebiotic product. the prebiotic content is dosed as follows: Inulin at 5g/d, GOS at 5g/d and Resistant Starch at 20g/d.

* Participants will be asked to consume their assigned product once per day. The length of the intervention is 14 days

* Participants will provide two stool samples: one on day 0 and one on day 14 of the study to identify changes in gut microbiota composition

* Urine samples will also be provided at day 0 and at day 14 looking for changes in urinary metabolites

* Participants will also be asked to fill out various mood related questionnaires on days 0 and 14 of the study.

* You will take your own blood pressure and heart rate on day 0 and day 14 and at least 3 times per week to try and link changes in gut microbiota composition with vascular health.

* Volunteers will be given containers and specimen pots to take home for initial and final faecal and urine collections. No treatment will be issued until initial stool and urine sample has been provided

* Maintenance of normal dietary patterns throughout the study is essential and participants will be required to complete food and drink logs throughout the study via a web-based app - on three consecutive days with one of the days being a weekend

Study Timeline

• Study Start: 2022-01-01
• Study First Submitted: 2022-08-24
• Study First Submitted QC: 2022-09-02
• Study First Posted: 2022-09-06
• Primary Completion: 2022-09-23
• Study Completion: 2022-09-23
• Status Verified: 2023-03
• Last Update Submitted: 2023-03-06
• Last Update Posted: 2023-03-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 20

Inclusion Criteria

• Volunteer is healthy at the time of pre-examination
• Volunteer has high perceived stress levels (own self-assessment)
• Volunteer is aged ≥ 18 to ≤ 65 years at the time of pre-examination
• Volunteer is able and willing to comply with the study instructions
• Volunteer is suitable for participation in the study according to the investigator/study personnel
• Written informed consent is given by volunteer

Exclusion Criteria

• No command of any local language
• Gastrointestinal disorders including IBS, IBD or other conditions that might affect the gut environment
• Food allergies or intolerances
• Using drugs (e.g. antibiotics) influencing gastrointestinal function (8 weeks before intervention)
• Use of laxatives
• Participants with any form of diagnosed diabetes (types I and II)
• Volunteers currently involved or will be involved in another clinical or food study
• History of drug (pharmaceutical or recreational) or alcohol abuse.
• participants are pregnant or are lactating
• Regular intake of probiotic or prebiotic supplements
• Smoking

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Prebiotic	GOS, Inulin, RS2	Consume prebiotic combination for two weeks
prebiotic and polyphenol	prebiotics and polyphenols	Combination of prebiotics and polyphenols for two weeks
Polyphenol	Blueberry, cranberry, green tea extract, cocoa	Consume polyphenol combination for two weeks
Placebo	Maltodextrin	maltodextrin placebo for two weeks

Primary Outcome Measures

Name	Time	Method
Mood Questionnaires	baseline, pre-intervention, then After 14 days of intervention	various mood questionnaires
Bacteriology	baseline, pre-intervention, then After 14 days of intervention	Changes in bacteriology

Secondary Outcome Measures

Name	Time	Method
Blood pressure	baseline, pre-intervention, then After 14 days of intervention. at least three times per week also	Blood pressure taken systolic, diastolic and pulse

Trial Locations

Locations (1)

University of Reading; 🇬🇧 Reading, Berkshire, United Kingdom