Blackberry Flavonoid Absorption and Effects on Intestinal Bacteria

This study has been completed.
Sponsor:
Collaborator:
Information provided by (Responsible Party):
Janet Novotny, USDA Beltsville Human Nutrition Research Center
ClinicalTrials.gov Identifier:
NCT01944579
First received: September 12, 2013
Last updated: July 21, 2014
Last verified: July 2014

September 12, 2013
July 21, 2014
September 2013
April 2014   (final data collection date for primary outcome measure)
Change in fecal microbiota [ Time Frame: 0 weeks, 4 weeks ] [ Designated as safety issue: No ]
Feces will be analyzed for bacterial typing at 0 and 4 weeks of each diet period.
Same as current
Complete list of historical versions of study NCT01944579 on ClinicalTrials.gov Archive Site
Change in blackberry nutrients & metabolites [ Time Frame: 0, 30, 60, 90, 120, 150, 180, 240, 300, 360, and 420 minutes ] [ Designated as safety issue: No ]
Same as current
  • Change in gene expression [ Time Frame: 0 weeks, 4 weeks ] [ Designated as safety issue: No ]
    Gene expression in whole blood will be evaluated at the beginning and end of each diet period, through global gene expression using the Affymetrix platform. Changes in specific genes observed with global gene expression technology will be confirmed through RT-PCR.
  • Change in metabolomics [ Time Frame: 0 weeks, 4 weeks ] [ Designated as safety issue: No ]
    Blood, urine, and feces will be analyzed by a technique called metabolomics, which is a broad sampling of metabolites.
  • Change in biomarkers of cancer [ Time Frame: 0 weeks, 4 weeks ] [ Designated as safety issue: No ]
    Biomarkers of cancer risk such as oxidative stress and inflammatory markers will be analyzed at the beginning and end of each diet period.
  • Change in lipopolysaccharide [ Time Frame: 0 weeks, 4 weeks ] [ Designated as safety issue: No ]
    Lipopolysaccharide will be measured in the blood as a measure of gut leakiness.
Same as current
 
Blackberry Flavonoid Absorption and Effects on Intestinal Bacteria
Not Provided

Intestinal bacteria can metabolize unabsorbed polyphenols (plant compounds) to produce smaller molecules which may impact health. In addition, evidence suggests that this process may be affected by body fatness. This study aims to investigate absorption of blackberry polyphenols, their impact on intestinal bacteria, polyphenol metabolites formed by intestinal bacteria, and how these processes differ for obese and lean individuals. It is hypothesized that polyphenol absorption and metabolism will differ between obese and lean individuals and that differences in intestinal microbiota may play a role.

Not Provided
Interventional
Not Provided
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double Blind (Investigator, Outcomes Assessor)
Metabolic Syndrome
  • Other: Blackberries
    Participants will receive blackberries as part of a controlled diet.
  • Other: Control
    Participants will receive a control food (jello) as part of a controlled diet.
  • Experimental: Control-Blackberry
    Participants will receive a controlled diet with the control food (jello) first and then cross over to the controlled diet with blackberries.
    Interventions:
    • Other: Blackberries
    • Other: Control
  • Experimental: Blackberry-Control
    Participants will receive a controlled diet with blackberries first and then cross over to the controlled diet with the control food (jello).
    Interventions:
    • Other: Blackberries
    • Other: Control
Not Provided

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
46
April 2014
April 2014   (final data collection date for primary outcome measure)

Inclusion Criteria:

  • 25-75 years old

Exclusion Criteria:

  • Use of blood-thinning medications such as Coumadin (warfarin), Dicumarol (dicumarol), or Miradon (anisindione)
  • Presence of any gastrointestinal disease, metabolic disease, or malabsorption syndromes that may interfere with the study goals
  • Have been pregnant during the previous 12 months, are currently pregnant or lactating, or plan to become pregnant during the study
  • Type 2 diabetes requiring the use of oral antidiabetic agents or insulin
  • Fasting triglycerides greater than 300 mg/dL
  • Fasting glucose greater than 126 mg/dL
  • History of eating disorders or other dietary patterns which are not consistent with the dietary intervention (e.g., vegetarians, very low fat diets, high protein diets)
  • Use of prescription or over-the-counter antiobesity medications or supplements (e.g., phenylpropanolamine, ephedrine, caffeine) during and for at least 6 months prior to the start of the study or a history of a surgical intervention for obesity
  • Active cardiovascular disease (such as a heart attack or procedure within the past three months or participation in a cardiac rehabilitation program within the last three months, stroke, or history/treatment for transient ischemic attacks in the past three months, or documented history of pulmonary embolus in the past six months).
  • Use of any tobacco products in past 3 months
  • Unwillingness to abstain from herbal supplements for two weeks prior to the study and during the study
  • Known (self-reported) allergy or adverse reaction to blackberries or other study foods
  • Unable or unwilling to give informed consent or communicate with study staff
  • Self-report of alcohol or substance abuse within the past twelve months and/or current acute treatment or rehabilitation program for these problems (Long-term participation in Alcoholics Anonymous is not an exclusion)
  • Other medical, psychiatric, or behavioral factors that in the judgment of the Principal Investigator may interfere with study participation or the ability to follow the intervention protocol
Both
25 Years to 75 Years
Yes
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT01944579
HS40
No
Janet Novotny, USDA Beltsville Human Nutrition Research Center
Janet Novotny
National Cancer Institute (NCI)
Principal Investigator: Janet A Novotny, Ph.D. USDA Beltsville Human Nutrition Research Center
USDA Beltsville Human Nutrition Research Center
July 2014

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP