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ObesityNCT03413735

Dietary Green Tea Confection For Resolving Gut Permeability-Induced Metabolic Endotoxemia In Obese Adults

A study testing Green Tea Extract in people with Obesity and Endotoxemia, run by Ohio State University at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This study is focused on assessing gastrointestinal-level improvements by which green tea limits metabolic endotoxemia. It is completed in two phases. Phase I consists of a pharmacokinetic study to examine the bioavailability of green tea catechins among lean and obese persons who consumed a single dose of a green tea… Read more about this study

Who is it for?
Ages 18 to 50 yearsHealthy volunteers can take part
Conditions the study is for
Obesity, Endotoxemia, Inflammation
What is being tested?
Green Tea Extract
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
40 participants
Where
1 siteUnited States
Study dates
29 Aug 2018to 30 Jul 2019
Phase
Interventional
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 50 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Overweight/obese (BMI = 28-40 kg/m2)
  • Fasting glucose < 126 mg/dL
  • Normotensive (blood pressure < 140/90 mmHg)
  • Non-dietary supplement user
  • Non-smoker

Who cannot join

  • Regular tea drinkers (> 2 cups/week)
  • Vegetarians
  • Use of medications to manage diabetes, hypertension, or hyperlipidemia
  • Use of any medications known to be contraindicated for use with green tea ingestion
  • User of dietary supplements, prebiotics, or probiotics
  • Recent use of antibiotics or anti-inflammatory agents
Show all 11Show fewer
  • Women who are pregnant or lactating or have initiated or changed birth control in the past 3-months
  • Individuals with gastrointestinal disorders or surgeries
  • Individuals with hemochromatosis
  • Alcohol intake > 3 drinks per day
  • Any history of cancer

Trial locations and contacts

1 site in 1 country.

United States1 site
  • Ohio State University

    Columbus, Ohio, 43210

Other trials in United States

About this study

This study is focused on assessing gastrointestinal-level improvements by which green tea limits metabolic endotoxemia. It is completed in two phases. Phase I consists of a pharmacokinetic study to examine the bioavailability of green tea catechins among lean and obese persons who consumed a single dose of a green tea extract (GTE)-containing confection. These persons will then complete phase 2, which consists of a parallel design randomized controlled in which lean and obese persons will consume placebo or GTE confections.

It is expected that catechin-rich green tea will improve gut barrier function to prevent endotoxin translocation and associated low-grade inflammation. Outcomes will therefore support dietary recommendations for green tea to alleviate obesity-related inflammatory responses. Specifically, the study is expected to demonstrate that a green tea confection snack food can attenuate metabolic endotoxemia in association with restoring gastrointestinal health.

Read the detailed description

Obesity is a major public health concern in the United States, with over two-thirds of the adult population classified as overweight or obese. Obesity is characterized by low-grade chronic inflammation that, in part, is mediated by metabolic endotoxemia. Metabolic endotoxemia describes increased circulating levels of gut-derived endotoxin (a bacterial product derived from Gram-negative bacteria in the intestines) that results from gut barrier dysfunction, a phenomenon that is common in obesity. Studies in rodents models have shown that dietary supplementation with green tea extract (GTE) reduces metabolic endotoxemia in association with improved gut health. This clinical trial will therefore investigate the extent to which a green tea confection snack food can alleviate metabolic endotoxemia and restore gut health in obese humans. It is hypothesized that 4-week daily ingestion of a green tea extract (GTE)-rich confection will limit metabolic endotoxemia by decreasing gut barrier permeability. This study will address the following objectives: 1) define alterations in catechin pharmacokinetics in obese compared with healthy adults, 2) demonstrate improvements in gut barrier function by GTE, and 3) demonstrate GTE-mediated amelioration of microbial dysbiosis.

To test the hypothesis, all participants will initially complete a 12-h pharmacokinetics study to define the influence of obesity on catechin bioavailability and metabolism. They will then be randomized to complete a double-blind, randomized, placebo-controlled trial where they will receive a GTE-rich or placebo confection for 4 weeks. Prior to and upon completing the intervention, participants will undergo a gut permeability test, fecal samples will be collected for microbiota composition analysis, and blood samples will be collected to assess endotoxin and inflammatory biomarkers. Upon successfully completing this study, it is anticipated that chronic consumption of a green tea confection will be demonstrated to be an effective dietary strategy to reduce metabolic endotoxemia and improve gut health.

Being tested
Green Tea Extract, Placebo
Medical subject headings
Obesity, Endotoxemia, Inflammation

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Green Tea ExtractOther

    Confections containing green tea extract that will be ingested daily for 4 weeks

  • PlaceboOther

    Confections containing no green tea extract that will be ingested daily for 4 weeks

Study groups in NCT03413735
Study groupRoleWhat they receive
Placebo ConfectionPlacebo comparatorConfection without green tea extract consumed daily for 4 weeks
Receives: Other: Placebo
Green Tea Extract-ConfectionExperimentalConfection with green tea extract consumed daily for 4 weeks
Receives: Other: Green Tea Extract

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Endotoxin

    Serum endotoxin concentration

    Measured: Week 0 - Fasting

  2. Endotoxin

    Serum endotoxin concentration

    Measured: Week 2 - Fasting

  3. Endotoxin

    Serum endotoxin concentration

    Measured: Week 4 - Fasting

Secondary outcomes (24)
  1. Gut Permeability - Lactulose to Mannitol Ratio

    Urinary Lactulose/Mannitol Ratio (mg/mg)

    Measured: Week 0 - 0-5 hours

  2. Gut Permeability - Lactulose to Mannitol Ratio

    Urinary Lactulose/Mannitol Ratio (mg/mg)

    Measured: Week 0 - 6-24 hours

  3. Gut Permeability - Lactulose to Mannitol Ratio

    Urinary Lactulose/Mannitol Ratio (mg/mg)

    Measured: Week 4 - 0-5 hours

  4. Gut Permeability - Lactulose to Mannitol Ratio

    Urinary Lactulose/Mannitol Ratio (mg/mg)

    Measured: Week 4 - 6-24 hours

  5. Gut Permeability - Sucralose to Erythritol Ratio

    Urinary Sucralose/Erythritol Ratio (mg/mg)

    Measured: Week 0 - 6-24 hours

  6. Gut Permeability - Sucralose to Erythritol Ratio

    Urinary Sucralose/Erythritol Ratio (mg/mg)

    Measured: Week 0 - 0-24 hours

  7. Urinary Sucralose/Erythritol Ratio (mg/mg)

    Ratio of excretion of urinary sugars (Sucralose to Erythritol)

    Measured: Week 4 - 6-24 hours

  8. Gut Permeability - Sucralose to Erythritol Ratio

    Urinary Sucralose/Erythritol Ratio (mg/mg)

    Measured: Week 4 - 0-24 hours

  9. Firmicutes to Bacteroidetes Ratio - Microbiota

    Ratio of fecal relative Firmicutes (% abundance)/Bacteroidetes (% abundance)

    Measured: Week 0

  10. Firmicutes to Bacteroidetes Ratio - Microbiota

    Ratio of fecal relative Firmicutes (% abundance)/Bacteroidetes (% abundance)

    Measured: Week 4

  11. Bioavailability - Epigallocatechin Gallate

    Area under the curve (AUC) of plasma epigallocatechin calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection. Epigallocatechin gallate is measured in umol/L over time (hours) resulting in the AUC.

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of a green tea confection

  12. Bioavailability - Epigallocatechin

    Area under the curve (AUC) of plasma epigallocatechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection. Epigallocatechin is measured in umol/L over time (hours) resulting in the AUC.

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of a green tea confection

  13. Bioavailability - Epicatechin Gallate

    Area under the curve (AUC) of plasma epicatechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection. Epicatechins is measured in umol/L over time (hours) resulting in the AUC.

    Measured: Prior to the intervention enrollment...0-12 hours post-ingestion of a green tea confection

  14. Bioavailability - Epicatechin

    Area under the curve (AUC) of plasma epicatechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection. Epicatechin is measured in umol/L over time (hours) resulting in the AUC.

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of a green tea confection

  15. Cmax of Epigallocatechin Gallate

    Maximum plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  16. Cmax of Epigallocatechin

    Maximum plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  17. Cmax of Epicatechin Gallate

    Maximum plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  18. Cmax of Epicatechin

    Maximum plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  19. Tmax of Epigallocatechin Gallate

    Time to maximal plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  20. Tmax of Epigallocatechin

    Time to maximal plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  21. Tmax of Epicatechin Gallate

    Time to maximal plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  22. Tmax of Epicatechin

    Time to maximal plasma concentration of catechins calculated from blood collected at 0, 0.25, 0.5, 1, 2, 3, 5, 8, 10, 12 hours post-ingestion of green tea confection

    Measured: Prior to intervention enrollment...0-12 hours post-ingestion of green tea confection

  23. Calprotectin

    Fecal calprotectin concentration

    Measured: Week 0

  24. Calprotectin

    Fecal calprotectin concentration

    Measured: Week 4

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted29 Jan 2018
  2. Study start29 Aug 2018
  3. Primary completion30 Jul 2019
  4. Study completion30 Jul 2019

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Prevention
Allocation
Randomised
Intervention model
Parallel groups
Masking
Triple blind
Who is masked
Participant, Investigator, Outcomes assessor
Enrolment
40 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03413735
Sponsor's protocol ID
2017H0246
Status last verified
May 2025
First submitted
22 Jan 2018
Last updated
13 Jun 2025
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: Data will be published as aggregate only. Data sharing may be possible pending institutional agreements.

Publications

  • Li J, Sapper TN, Mah E, Moller MV, Kim JB, Chitchumroonchokchai C, McDonald JD, Bruno RS. Green tea extract treatment reduces NFkappaB activation in mice with diet-induced nonalcoholic steatohepatitis by lowering TNFR1 and TLR4 expression and ligand availability. J Nutr Biochem. 2017 Mar;41:34-41. doi: 10.1016/j.jnutbio.2016.12.007. Epub 2016 Dec 21.

    PubMed 28038359
  • Li J, Sasaki GY, Dey P, Chitchumroonchokchai C, Labyk AN, McDonald JD, Kim JB, Bruno RS. Green tea extract protects against hepatic NFkappaB activation along the gut-liver axis in diet-induced obese mice with nonalcoholic steatohepatitis by reducing endotoxin and TLR4/MyD88 signaling. J Nutr Biochem. 2018 Mar;53:58-65. doi: 10.1016/j.jnutbio.2017.10.016. Epub 2017 Nov 3.

    PubMed 29190550

Questions about this trial

What is this clinical trial studying?

A study testing Green Tea Extract in people with Obesity and Endotoxemia, run by Ohio State University at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 13 Jun 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

Yes. Results are posted in the registry (first posted 13 Jun 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Endotoxin (time frame: Week 0 - Fasting). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT03413735, which also lists 2 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 Jun 2025; AzTrials last refreshed its copy on 6 Nov 2026.

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