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The Effects of Dietary Fiber on the Gut Microbiome and HDL Particles of Human Subjects

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03785860
Recruitment Status : Completed
First Posted : December 24, 2018
Last Update Posted : January 8, 2021
Information provided by (Responsible Party):
University of California, Davis

Brief Summary:
The objective of this project is to conduct a randomized-order, double-blinded cross-over trial in 20 participants to test the effects of a dietary fiber formulation on gut microbiota composition and short chain fatty acid production, lipid profiles, glucose sensitivity, intestinal permeability, overall gut health, and markers of inflammation.

Condition or disease Intervention/treatment Phase
Gut Microbiota Other: Dietary Fiber Other: Placebo Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 20 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Basic Science
Official Title: The Effects of Dietary Fiber on the Gut Microbiome and HDL Particles of Human Subjects
Actual Study Start Date : May 13, 2019
Actual Primary Completion Date : December 21, 2019
Actual Study Completion Date : December 23, 2019

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Dietary Fiber

Arm Intervention/treatment
Placebo Comparator: Placebo
On the Placebo arm of the intervention, participants will consume a placebo powder.
Other: Placebo
Placebo will be given in a powder form to mix with a beverage of one's choice.

Active Comparator: Dietary Fiber
On the Dietary Fiber arm of the intervention, participants will consume a fiber powder.
Other: Dietary Fiber
Dietary fiber will be given in a powder form to mix with a beverage of one's choice.

Primary Outcome Measures :
  1. Change in gut microbiota [ Time Frame: One month time frame for dietary fiber to affect the gut microbiota of participants ]
    Gene sequencing and data analysis will be conducted to explore the change in gut microbial abundance and diversity. Specifically, the primary outcome measure will be change in the proportion of Bifidobacterium, Lactobacillus, and/or Akkermansia muciniphila.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy male and female adults 18-45 years old
  • BMI: 23.0-32.0 kg/m2 ("overweight")
  • Current diet includes low quantity of fiber, defined as less than approximately 15g/day, or equivalent to approximately 4 servings of fruit, vegetable, legume, or whole grain combined per day, and determined using diet recall.
  • Willingness to consume prebiotic fiber drink daily for 4 weeks, and a placebo drink for 4 weeks, as well as a 4-week washout period with no intervention.
  • Willingness to provide diet records, blood samples and stool samples (self-collected) biweekly for the duration of the study (7 total collections).
  • Willingness to adhere to "diet control period" biweekly (eating the same, self-selected foods and abstaining from alcohol each day for 3 days prior to each stool collection/blood draw).
  • General bowel movement frequency of at least once every three days and maximum of two times per day.

Exclusion Criteria:

  • A plan to or desire to lose weight
  • Smoker
  • Anemia and difficulty with blood draws
  • Currently, within previous 6 weeks of the study, or during the study taken probiotic or prebiotic formulations (food products considered to have these properties in their natural or unadulterated forms are acceptable).
  • Antibiotic use during the study or within 6 months prior to study commencement.
  • Medication: statins, blood pressure medications, other prescription medications
  • Pregnant, planning to be pregnant or breast feeding at any point during the study or study enrollment.
  • Start or change in use of hormonal birth control in the last 6 months or plans to change or start use of hormonal birth control during the study period
  • Allergies to any prebiotic or placebo ingredients - Prebiotic ingredients: Resistant Tapioca Starch, Fructooligosaccharide, Sugarcane Fiber, Agave Inulin, Gum Arabic, Xanthan Gum, Apple Powder, Raspberry Powder, Blueberry Powder / Placebo Blend: Rice Flour, Xanthan Gum, Grape Powder, Plum Powder
  • Illness (flu/cold in the last two weeks)
  • Documented chronic diseases including diabetes, thyroid disease, metabolic syndrome, hypertension, cancer, or previous cardiovascular events
  • Irritable bowel syndrome, celiac disease, or any inflammatory bowel disease (including Crohn's Disease, and/or Ulcerative colitis)
  • Any immunosuppression symptoms at any point during the study or study enrollment
  • Consumption of >1 alcoholic drink/day or frequent binge drinking (>3 alcoholic drinks in one episode) > 1 day per month
  • Plans to change or recent significant changes in lifestyle (e.g. diet or exercise routine, major travel, etc)
  • Recent weight fluctuations (greater than 10% in the last six months)
  • Regular use of over-the-counter pain medications (>1/week)
  • Taking prescription lipid medications (e.g. statins) or other supplements known to alter lipoprotein metabolism such as isoflavones
  • Recent medical procedure such as surgery within the last 6 months
  • Any changes in the above during the course of the study

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03785860

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United States, California
University of California, Davis Department of Nutrition
Davis, California, United States, 95616
Sponsors and Collaborators
University of California, Davis
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Responsible Party: University of California, Davis Identifier: NCT03785860    
Other Study ID Numbers: 1335956
First Posted: December 24, 2018    Key Record Dates
Last Update Posted: January 8, 2021
Last Verified: January 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No