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HealthyFIDNCT06086145

Biomarker-estimated Flavanol Intake in Davis (FID)

An observational study of Healthy and Diet, run by University of California, Davis at 1 site in United States.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

Flavanols are compounds present in plants, including apples, berries, peaches, cocoa-derived products and certain beverages like tea. Following intake, they are absorbed and broken down into smaller compounds called 'metabolites'. Some of these metabolites are excreted in urine. Read more about this study

Who is it for?
Ages 25 to 75 yearsHealthy volunteers can take part
Conditions the study is for
Healthy, Diet, Adults
How many people
200 participants
Where
1 siteUnited States
Study dates
2 Nov 2023to Dec 2026
Phase
Observational
Are there results?
Not yet: the study is under way

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 25 to 75 years
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Study population: Free living adults in Davis and the greater Sacramento area of California.

Who may be able to join

  • 25 - 75 years old
  • Male or female
  • BMI 18.5 - 34.9 kg/m2
  • Weight ≥ 110 pounds
  • Computer, tablet or smart phone with cellular data/Wi-Fi to establish video call communication

Who cannot join

  • Adults unable to consent
  • Prisoners
  • Non-English speaking*
  • BMI ≥ 35 kg/m2
  • Indications of substance or alcohol abuse within the last 3 years
  • Cancer of the GI tract, previous GI surgery (except appendectomy) or GI stoma
Show all 10Show fewer
  • History of difficult blood draws
  • Diarrhea, defined as 3 or more loose or liquid stools/day, within the last 3 months or antibiotic intake within the last 3 months
  • Currently participating in a clinical or dietary intervention study
  • Non-English speaking volunteers will be excluded for safety reasons, as we do not have staff that can adequately provide interpretation services that can explain and answer questions with regard to study procedures.

Trial locations and contacts

1 site in 1 country.

United States1 site
  • University of California Davis

    Davis, California, 95618

Other trials in United States

About this study

Official title: Flavanol Intake in Davis (FID) Study: Biomarker-estimated Habitual (-)-Epicatechin and Flavanol Intake in Adults

Flavanols are compounds present in plants, including apples, berries, peaches, cocoa-derived products and certain beverages like tea. Following intake, they are absorbed and broken down into smaller compounds called 'metabolites'. Some of these metabolites are excreted in urine. In this study, we hope to collect urine and examine the metabolites to learn more about the types and amounts of flavanols that people are consuming as part of their usual diet.

Read the detailed description

Flavanols, including the monomers (-)-epicatechin and (+)-catechin, and their related oligomeric derivatives, the procyanidins, are a group of plant-derived, dietary bioactives amply present in the diet. Supported by accumulating epidemiological studies and outcomes from the first large-scale randomized study with bioactives, the COcoa Supplement and Multivitamin Outcomes Study (COSMOS), the Academy of Nutrition and Dietetics released the first dietary recommendation for flavan-3-ols intake in the United States (US). This recommendation suggests the consumption of 400-600 mg/d of flavan-3-ols to mediate cardiometabolic beneficial effects, including the reduction of cardiovascular disease risk. While previous studies have aimed at assessing dietary intake of this group of bioactives, the tools used for these assessments were based on dietary questionnaires and food content databases. These tools are subjective and known to present significant limitations. Recently, our laboratory developed a series of nutritional biomarkers to objectively assess flavanol intake and thus, overcome limitations inherent to previous methods. These biomarkers are based on the quantification of a series of flavanol metabolites, including the 5-(3,4-dihydrophenyl)-γ-valerolactone metabolites (gVLM) and the structurally related (-)-epicatechin metabolites (SREMs). These biomarkers provide complementary information; as while gVLM provide information about the intake of flavanols in general, SREMs are specific biomarkers of (-)-epicatechin intake. In addition, gVLM are surrogate biomarkers, which means that this biomarker allows ranking volunteers from low to high flavanol consumers without providing information on absolute intake. On the other hand, SREMs proved to perform as a recovery biomarker when assessed in 24-hour urine, thus providing absolute amount of (-)-epicatechin consumed. While gVLM and SREM biomarkers have been used to assess the intake of flavanols and epicatechin in the United Kingdom, little is known about biomarker-estimated intake of flavanols in the US, and even less when considering the use of SREM as a recovery biomarker. Therefore, the characterization of flavanol and epicatechin intake in a US population will provide essential information to understand efforts to promote flavanol intake based on current dietary recommendations and thus increase access of the health benefit related to the consumption of these bioactives to the public in general.

Conditions
Healthy, Diet, Adults
Being tested
No intervention
Keywords
Flavanols, Dietary flavanols, Phytonutrients, Bioactives, Observational

What participants receive

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

  • No interventionOther

    No intervention

Study groups in NCT06086145
Study groupRoleWhat they receive
Adults in Davis and the greater Sacramento area of CaliforniaAdults in Davis and the greater Sacramento area of California
Receives: Other: No intervention

What is being measured

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

  1. Biomarker-estimated (-)-epicatechin and flavanol intake

    Biomarker-estimated habitual (-)-epicatechin and flavanol intake assessed as the urinary concentration of SREM and gVLM in 24 hr urine.

    Measured: 1 day

Secondary outcomes (5)
  1. Subgroup analysis of biomarker-estimated (-)-epicatechin and flavanol intake by age, sex, anthropometric and clinical characteristics

    Characterization of biomarker-estimated habitual (-)-epicatechin and flavanol intake (assessed as urinary concentrations of SREM and gVLM in 24 hr urine) by age, sex, anthropometric and clinical (health or disease status) characteristics.

    Measured: 1 day

  2. Change of biomarker-estimated (-)-epicatechin and flavanol intake as a function of the intake of individual foods

    Change of the biomarker-estimated habitual (-)-epicatechin and flavanol intake (assessed as the urinary concentration of SREM and gVLM in 24 hr urine) as a function of the intake of individual foods (assessed by the Automated Self-Administered 24-Hour (ASA24) Dietary Assessment Tool).

    Measured: 1 day

  3. Change of biomarker-estimated (-)-epicatechin and flavanol intake as a function of diet quality

    Change of the biomarker-estimated habitual (-)-epicatechin and flavanol intake (assessed as the urinary concentration of SREM and gVLM in 24 hr urine) as a function of diet quality (assessed by food frequency questionnaire; Diet History Questionnaire III (DHQ III)).

    Measured: 1 day

  4. Inter-day variation of biomarker-estimated (-)-epicatechin and flavanol intake

    Inter-day variation of the biomarker-estimated habitual (-)-epicatechin and flavanol intake (assessed as the urinary concentration of SREM and gVLM in 24 hr urine) in a sub-cohort of volunteers.

    Measured: 1 day

  5. Biomarker-estimated (-)-epicatechin and flavanol intake in spot urine

    Biomarker-estimated habitual (-)-epicatechin and flavanol intake assessed as the urinary concentration of SREM and gVLM in spot urine.

    Measured: 1 day

Timeline

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

  1. First posted17 Oct 2023
  2. Study start2 Nov 2023
  3. Primary completionDec 2026 (estimated)
  4. Study completionDec 2026 (estimated)

Resources

More details

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

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Cross-sectional
Enrolment
200 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06086145
Sponsor's protocol ID
2052789
Acronym
FID
Status last verified
Sep 2026
First submitted
7 Sep 2023
Last updated
14 Sep 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Bhagwat, S. and Haytowitz, D.B. (2015). USDA Database for the Proanthocyanidin Content of Selected Foods, Release 2 (2015). Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, ARS, USDA. https://doi.org/10.15482/USDA.ADC/1324621.

  • Bhagwat, S. and Haytowitz, D.B. (2016). USDA Database for the Flavonoid Content of Selected Foods. Release 3.2 (November 2015). Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, ARS, USDA. https://doi.org/10.15482/USDA.ADC/1324465.

  • Raman G, Avendano EE, Chen S, Wang J, Matson J, Gayer B, Novotny JA, Cassidy A. Dietary intakes of flavan-3-ols and cardiometabolic health: systematic review and meta-analysis of randomized trials and prospective cohort studies. Am J Clin Nutr. 2019 Nov 1;110(5):1067-1078. doi: 10.1093/ajcn/nqz178.

    PubMed 31504087
  • Sesso HD, Manson JE, Aragaki AK, Rist PM, Johnson LG, Friedenberg G, Copeland T, Clar A, Mora S, Moorthy MV, Sarkissian A, Carrick WR, Anderson GL; COSMOS Research Group. Effect of cocoa flavanol supplementation for the prevention of cardiovascular disease events: the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial. Am J Clin Nutr. 2022 Jun 7;115(6):1490-1500. doi: 10.1093/ajcn/nqac055.

    PubMed 35294962
  • Crowe-White KM, Evans LW, Kuhnle GGC, Milenkovic D, Stote K, Wallace T, Handu D, Senkus KE. Flavan-3-ols and Cardiometabolic Health: First Ever Dietary Bioactive Guideline. Adv Nutr. 2022 Dec 22;13(6):2070-2083. doi: 10.1093/advances/nmac105.

    PubMed 36190328
  • Wang Y, Chung SJ, Song WO, Chun OK. Estimation of daily proanthocyanidin intake and major food sources in the U.S. diet. J Nutr. 2011 Mar;141(3):447-52. doi: 10.3945/jn.110.133900. Epub 2011 Jan 26.

    PubMed 21270367
  • Bai W, Wang C, Ren C. Intakes of total and individual flavonoids by US adults. Int J Food Sci Nutr. 2014 Feb;65(1):9-20. doi: 10.3109/09637486.2013.832170. Epub 2013 Sep 11.

    PubMed 24020353
  • Kuhnle GGC. Nutrition epidemiology of flavan-3-ols: The known unknowns. Mol Aspects Med. 2018 Jun;61:2-11. doi: 10.1016/j.mam.2017.10.003. Epub 2017 Nov 16.

    PubMed 29146101
  • Ottaviani JI, Fong R, Kimball J, Ensunsa JL, Britten A, Lucarelli D, Luben R, Grace PB, Mawson DH, Tym A, Wierzbicki A, Khaw KT, Schroeter H, Kuhnle GGC. Evaluation at scale of microbiome-derived metabolites as biomarker of flavan-3-ol intake in epidemiological studies. Sci Rep. 2018 Jun 29;8(1):9859. doi: 10.1038/s41598-018-28333-w.

    PubMed 29959422
  • Ottaviani JI, Fong R, Kimball J, Ensunsa JL, Gray N, Vogiatzoglou A, Britten A, Lucarelli D, Luben R, Grace PB, Mawson DH, Tym A, Wierzbicki A, Smith AD, Wareham NJ, Forouhi NG, Khaw KT, Schroeter H, Kuhnle GGC. Evaluation of (-)-epicatechin metabolites as recovery biomarker of dietary flavan-3-ol intake. Sci Rep. 2019 Sep 11;9(1):13108. doi: 10.1038/s41598-019-49702-z.

    PubMed 31511603
  • Ottaviani JI, Borges G, Momma TY, Spencer JP, Keen CL, Crozier A, Schroeter H. The metabolome of [2-(14)C](-)-epicatechin in humans: implications for the assessment of efficacy, safety, and mechanisms of action of polyphenolic bioactives. Sci Rep. 2016 Jul 1;6:29034. doi: 10.1038/srep29034.

    PubMed 27363516
  • Ottaviani JI, Britten A, Lucarelli D, Luben R, Mulligan AA, Lentjes MA, Fong R, Gray N, Grace PB, Mawson DH, Tym A, Wierzbicki A, Forouhi NG, Khaw KT, Schroeter H, Kuhnle GGC. Biomarker-estimated flavan-3-ol intake is associated with lower blood pressure in cross-sectional analysis in EPIC Norfolk. Sci Rep. 2020 Oct 21;10(1):17964. doi: 10.1038/s41598-020-74863-7.

    PubMed 33087825

Questions about this trial

What is this clinical trial studying?

An observational study of Healthy and Diet, run by University of California, Davis 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 10 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: under way, not looking for participants, as of the sponsor's last update on 14 Sep 2026. 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. 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?

This study is still under way. Results are not available in the source record yet.

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?

Biomarker-estimated (-)-epicatechin and flavanol intake (time frame: 1 day). 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 NCT06086145, which also lists 12 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 14 Sep 2026.

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