Diet Interactions With Human Gut Microbiota. The Potential Role of Mediterranean Diet Adherence. DIAGRAM, a Pilot Study

• Conditions: Human Gut Microbiota
• Interventions: Other: dietary habits

• Registration Number: NCT03080532
• Lead Sponsor: University Hospital, Clermont-Ferrand

Brief Summary

Despite the strong evidence on health benefits of traditional MeD, not many studies have broadly and systematically been made for the potential role and relationship of the MeD in the composition of the gut microbiota.

Furthermore, little is known about the composition of the gut microbiota in individuals with defined dietary habits on the Mediterranean pattern.

This work is aiming at comparatively studying the gut microbiota of three different dietary oriented european populations. In particular, biological samples and related information will be collected from populations with high adherence to Mediterranean diet (MeD) in Crete - Greece and Molise region - Italy. These data will be comparatively assessed with those provided by a sample population with high adherence to Western diet in Auvergne - France.

Detailed Description

All the participants will give freely their written informed consent before their selection in the study.

Information on demographics, anthropometrics, vital signs, relevant medical history and concomitant medication, dietary habits, usual dietary intake and nutritional supplements will be collected. Habitual physical activity will be performed using the short form of the IPAQ survey. All inclusion and exclusion criteria will be checked by the investigator or co-investigator.

All selected volunteers will be asked to maintain their usual dietary habits and continue their normal physical habits. All volunteers will complete a follow-up questionnaire to obtain information about any changes in medication use, disease etc.

All selected volunteers will collect one stool sample and will complete two 24h dietary recalls, and questionnaires related to digestive function and life style.

Study Timeline

• Study Start: 2016-05
• Study First Submitted: 2016-09-09
• Primary Completion: 2017-02
• Status Verified: 2017-03
• Study First Submitted QC: 2017-03-09
• Last Update Submitted: 2017-03-09
• Study First Posted: 2017-03-15
• Last Update Posted: 2017-03-15
• Study Completion: 2017-09

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 60

Inclusion Criteria

• Aged 40 to 60 years
• Healthy (apparently free of diseases)
• Moderately physically active
• Habitually eating foods representative of their community (Cretan diet, Italian Mediterranean diet, French Auvergnat diet). The assessment of the consumption of such food will be based to a detailed dietary history retrieved by a nutrition specialist)

Exclusion Criteria

• Following any kind of treatment, notably antibiotics the last 3 months
• Sedentary lifestyle
• BMI <18.5 Kg/m2-or >27Kg/m2
• Smokers
• Excessive alcohol consumption (>3 glasses/d for men and >2 glasses/d for women)
• To be frequent travelers, particularly to overseas destinations
• Pregnant or women at lactation
• Individual unable to give informed consent or refusing to sign informed consent

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
european population	dietary habits	-

Primary Outcome Measures

Name	Time	Method
Bacterial species composition of the fecal microbiota	at day 1

Secondary Outcome Measures

Name	Time	Method
Core microbiota (Alpha and Beta diversity of samples)	at day 1	Taxonomic affiliation will be performed after clustering of sequences at 97% to bacterial/archaeal groups using referenced databases: GreenGenes-RDP. Alpha and Beta diversity of samples will be determined after normalization of sample size. Analyses will also determine the core microbiota of each Group.
Beta diversity of fecal microbiota	at day 1

Trial Locations

Locations (1)

CHU Clermont-Ferrand; 🇫🇷 Clermont-Ferrand, France