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Blackberry Flavonoid Absorption and Effects on Intestinal Bacteria

Články mohou překládat pouze registrovaní uživatelé
Přihlášení Registrace
Odkaz je uložen do schránky
PostaveníDokončeno
Sponzoři
Janet Novotny
Spolupracovníci
National Cancer Institute (NCI)

Klíčová slova

Abstraktní

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.

Termíny

Poslední ověření: 06/30/2014
První předloženo: 09/11/2013
Odhadovaná registrace vložena: 09/11/2013
První zveřejnění: 09/16/2013
Poslední aktualizace byla odeslána: 07/20/2014
Poslední aktualizace zveřejněna: 07/21/2014
Aktuální datum zahájení studie: 08/31/2013
Odhadované datum dokončení primární: 03/31/2014
Odhadované datum dokončení studie: 03/31/2014

Stav nebo nemoc

Metabolic Syndrome

Intervence / léčba

Other: Blackberries

Other: Control

Fáze

-

Skupiny zbraní

PažeIntervence / léčba
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.
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).

Kritéria způsobilosti

Věky způsobilé ke studiu 25 Years Na 25 Years
Pohlaví způsobilá ke studiuAll
Přijímá zdravé dobrovolníkyAno
Kritéria

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

Výsledek

Primární výsledná opatření

1. Change in fecal microbiota [0 weeks, 4 weeks]

Feces will be analyzed for bacterial typing at 0 and 4 weeks of each diet period.

Měření sekundárních výsledků

1. Change in blackberry nutrients & metabolites [0, 30, 60, 90, 120, 150, 180, 240, 300, 360, and 420 minutes]

Další výsledková opatření

1. Change in gene expression [0 weeks, 4 weeks]

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.

2. Change in metabolomics [0 weeks, 4 weeks]

Blood, urine, and feces will be analyzed by a technique called metabolomics, which is a broad sampling of metabolites.

3. Change in biomarkers of cancer [0 weeks, 4 weeks]

Biomarkers of cancer risk such as oxidative stress and inflammatory markers will be analyzed at the beginning and end of each diet period.

4. Change in lipopolysaccharide [0 weeks, 4 weeks]

Lipopolysaccharide will be measured in the blood as a measure of gut leakiness.

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