Use of Stable Carbon And Nitrogen Isotopes to Improve Dietary Assessment for Cardiovascular Disease
Public ClinicalTrials.gov record NCT04933656. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
In this research study, the investigators will use a novel approach to measure what people eat. The goal is to find out whether stable isotopes that can be measured in blood, hair, and fingernails are better at measuring what people eat than the surveys that are currently used. To meet the goal, the investigators will do three things. First, the investigators will feed study participants known amounts of foods and nutrients. Second, after study participants have eaten the food, the investigators will measure stable isotopes in samples of study participants' blood, hair, and fingernails. Third, the investigators will determine how well these samples reflect what was eaten. The investigators will also give surveys to study participants to determine how well the surveys reflect what was eaten. This will allow the investigators to do a relative comparison of the measurements from isotopes and surveys.
Study identification
- NCT ID
- NCT04933656
- Recruitment status
- Withdrawn
- Study type
- Interventional
- Phase
- Not applicable
- Enrollment
- Not listed
Conditions and interventions
Conditions
Interventions
- one 24 hr cycle of meals at a 2000 kcal level Dietary Supplement
- one 24 hr cycle of meals at a 2000 kcal level + one serving sugar sweetened beverage Dietary Supplement
- one 24 hr cycle of meals at a 2000 kcal level + two servings sugar sweetened beverage Dietary Supplement
- one 24 hr cycle of meals at a 2000 kcal level + three serving sugar sweetened beverage Dietary Supplement
Dietary Supplement
Eligibility (public fields only)
- Age range
- 21 Years to 74 Years
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jul 31, 2021
- Primary completion
- Jan 31, 2022
- Completion
- Jan 31, 2022
- Last update posted
- Jan 25, 2026
2021 – 2022
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| University of California, San Diego | San Diego | California | 92093 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04933656, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Jan 25, 2026 · Synced Sep 2, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04933656 live on ClinicalTrials.gov.