Assessing Diet, Stress Scores, and Other Health Metrics in Healthy Northern California Adults

January 27, 2026 updated by: USDA, Western Human Nutrition Research Center

Characterization, Perceived Stress Scores, Nut Consumption and Bowel Patterns of a Healthy Adult Population in Northern California: A Pilot Study

The purpose of this study is to gather health and nutrition data from the population of Davis, CA and surrounding areas. This data will be used to help us test and improve our study procedures for a larger planned study on peanut consumption and effects on cardiovascular disease (CVD) risk.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Participants will be recruited to complete an online survey asking questions about their stress levels, nut consumption, bowel patterns, body measurements, and county of residence. This data will be used to gain insight into the characteristics of this population.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
300

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • United States
    • California
      • Davis, California, United States, 95616
        • USDA Western Human Nutrition Research Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

Adults 18-65 years old, currently living in Yolo, Sacramento, Solano, Sutter, or Placer counties

Description

Inclusion Criteria:

  • Adults 18-65 years old
  • Currently living in Yolo, Sacramento, Solano, Sutter, or Placer counties
  • Able to complete an online survey written in English, on mobile phone, tablet, or computer

Exclusion Criteria:

  • Previous participation in the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Adults living in and around Davis, CA
Adults 18-65 years old, currently living in Yolo, Sacramento, Solano, Sutter, or Placer counties
Other: Online Survey
Online survey containing a Perceived Stress Score - 4 instrument, a modified food frequency questionnaire, and will measure reported age, sex, geographical location, usage of prescription medications, food allergies, and stool frequency and consistency.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Perceived Stress Score
Time Frame: Baseline
Measured using a validated tool for assessing perceived psychosocial stress within the last month, the Perceived Stress Scale 4 (PSS-4). Participants will report their answers to 4 questions in frequencies ranging from "Never" to "Very Often" on a 5 point scale
Baseline
Nut Consumption Frequency and Quantity
Time Frame: Baseline
Participants will input frequencies of nut and nut butter consumption and amounts of nuts and nut butter consumed in a typical month, using a modified food frequency questionnaire. Frequency will be reported as values ranging from "Never" to "6 or more times a week". Nut and nut butter consumption will be reported in cups and tablespoons
Baseline

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Consumption Frequency of Nut-Containing Foods
Time Frame: Baseline
Reported as monthly consumption of nut containing foods (granola, cereal, pastries, breads, or other snacks or sweets) in frequencies ranging from "Never" to "6 or more times per week"
Baseline
Prevalence of Food Allergies
Time Frame: Baseline
Reported as allergies to any of 9 common food allergens: (Peanuts, Tree Nuts, Egg, Wheat, Soy, Shellfish, Fish, Sesame, and Milk)
Baseline
Stool Frequency
Time Frame: Baseline
Reported as usual number of bowel movements per week
Baseline
Stool Consistency
Time Frame: Baseline
Reported using images of Bristol Scale stool types
Baseline
Body Mass Index (BMI)
Time Frame: Baseline
Calculated using participant-reported height and weight
Baseline
Prescription Drug Use
Time Frame: Baseline
Participants will confirm or deny intake of medications from 6 categories: (Asthma medications, Antibiotics or antivirals, weight loss medications, cholesterol or lipid lowering medications, blood pressure medications, or psychiatric medications)
Baseline
Age
Time Frame: Baseline
Reported as age in years
Baseline
Biological Sex
Time Frame: Baseline
Reported as sex assigned at birth
Baseline
Geographic Data
Time Frame: Baseline
Reported as current county of residence
Baseline

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
USDA, Western Human Nutrition Research Center

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Ryan Snodgrass, PhD, United States Department of Agriculture - Western Human Nutrition Research Center

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 8, 2025

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 20, 2026

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 20, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 20, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 1, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 5, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 29, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 27, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2337131

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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