Potato Fiber and Gastrointestinal Function: Phase 3

Not Applicable

Completed

• Conditions: Stool Frequency; Gastrointestinal Symptoms; Gastrointestinal Transit Time
• Interventions: Dietary Supplement: PF-RS; Dietary Supplement: PF-RO1; Dietary Supplement: PF-RO2; Dietary Supplement: Control

• Registration Number: NCT01964599
• Lead Sponsor: University of Florida

Brief Summary

The primary physiological impacts of fiber intake include the gastrointestinal effects of stool bulking, increased stool frequency and decreased gastrointestinal transit time (GTT). Fermentation of resistant starches by microbiota increases bacterial numbers, which increases fecal bulk and may impact frequency and transit time. The purpose of this study is to determine the effects of resistant potato starches (potato fiber) on stool frequency, transit time and microbiota in healthy individuals.

Detailed Description

Potato fiber (PF-RS, PF-RO1 and PF-RO2), supplemented in the diet of healthy individuals (n=60; 20 per group) and providing 30 g per day of fiber, will result in a significant changes in gastrointestinal function and microbiota profile.

Objectives:

1. To determine the effect of potato fibers on stool frequency, gastrointestinal transit time and gastrointestinal symptoms.

2. To determine the effect of potato fibers on microbial diversity in healthy individuals.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study First Submitted: 2013-10-14
• Study First Submitted QC: 2013-10-14
• Study First Posted: 2013-10-17
• Study Start: 2014-01
• Primary Completion: 2014-04
• Study Completion: 2014-04
• Status Verified: 2017-01
• Last Update Submitted: 2017-01-25
• Last Update Posted: 2017-01-26

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 90

Inclusion Criteria

• must be between the ages of 18 and 65.
• must be willing to complete daily questionnaires.
• must be willing to provide a social security number to receive study payment. Note: the subject can still participate if unwilling to provide SS#, but no financial reimbursement can be provided.
• must have internet access for the duration of the study
• must have usual fiber intake of <20 g/d based on Food Frequency Questionnaire such as the Block Fruit/Vegetable/Fiber Screener
• must be willing to consume kool-aid everyday for 2 periods of 14 days
• must be willing to provide stool samples

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Exclusion Criteria

• must not have a physician-diagnosed gastrointestinal disease or condition (such as ulcerative colitis, Crohn's disease, gastroparesis, cancer, peptic ulcer disease, Celiac disease, short bowel disease, ileostomy, colostomy other than GERD, constipation, diverticular disease)
• must not have a food allergy
• must not take dietary supplements (prebiotic and fiber supplements)

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
PF-RO1	Control	14 days consuming the PF-RO1 containing 30 g fiber and then 14 days consuming the control containing no fiber
PF-RO2	Control	14 days consuming the PF-RO2 containing 30 g fiber and then 14 days consuming the control containing no fiber
PF-RS	PF-RS	14 days consuming the PF-RS containing 30 g fiber and then 14 days consuming the control containing no fiber
PF-RS	Control	14 days consuming the PF-RS containing 30 g fiber and then 14 days consuming the control containing no fiber
PF-RO1	PF-RO1	14 days consuming the PF-RO1 containing 30 g fiber and then 14 days consuming the control containing no fiber
PF-RO2	PF-RO2	14 days consuming the PF-RO2 containing 30 g fiber and then 14 days consuming the control containing no fiber

Primary Outcome Measures

Name	Time	Method
Stool Frequency	6 weeks	Change in stool frequency determined by the daily questionnaire

Secondary Outcome Measures

Name	Time	Method
Gastrointestinal transit time	6 weeks	Change in gastrointestinal transit time determined by the Bristol Stool Scale
Microbial diversity	6 weeks	Baseline, treatment, control and washout stools (for a total of 6 samples) for each subject will be sampled for DNA isolation for microbiota studies. Microbial diversity measured by DGGE profiling (detects large distortions), qPCR to quantify changes and 16S rRNA sequencing (454) to identify treatment effects on specific bacteria (discovery) will be undertaken.
Gastrointestinal symptoms	6 weeks	Change in gastrointestinal symptoms determined by the daily questionnaire

Trial Locations

Locations (1)

University of Florida Food Science & Human Nutrition Dept; 🇺🇸 Gainesville, Florida, United States