Free-living Validation of the RFPM in Adolescents (FoodPhone2)

Validity of the Remote Food Photography Method to Measure Food Intake in Adolescents in Free-living Conditions

The primary aim of this small study is to test the validity of the Remote Food Photography Method and an updated SmartIntake app in a sample of adolescents. The investigators will test the validity (accuracy) of the method/app at estimating energy intake in free-living conditions over approximately three days compared to doubly labeled water. This is a small study that has low statistical power, but will provide important data nonetheless and inform future research.

Study Overview

• Status: Active, not recruiting
• Conditions: Food Intake; Energy Intake; Dietary Assessment; Food Photography
• Intervention / Treatment: Other: Tests of the validity of the RFPM and SmartIntake app.

Detailed Description

Energy intake (EI) is an important predictor of weight gain (1) and accurate methods to measure children's and adolescent's EI are needed. Self-report methods (e.g., 24-hour recall and food records) have their strengths and are frequently used to measure children's EI. Nonetheless, they also have significant limitations, including participant and caregiver burden and lack of near real-time data.

Our group developed the Remote Food Photography Method (RFPM) to measure the EI of adults in near real-time and the validity data in adults are exceptional; the RFPM underestimates EI in laboratory settings by less than 6% and in free-living conditions by less than 7% compared to weighed foods and by less than 4% compared to doubly labeled water (DLW) over 6 days. At the same time, participant burden is drastically reduced compared to self-report methods, as participants are only required to capture images of their food selection and plate waste with a smartphone app and send these images to the laboratory for analysis. This validation study aims to assess the accuracy of the RFPM and SmartIntake app in a sample of adolescents in free-living conditions.

• Study Type: Interventional
• Enrollment (Actual): 29
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Corby K Martin, PhD; Phone Number: (225) 763-2585; Email: Corby.Martin@pbrc.edu

Study Locations

• United States
  • Louisiana
    • Baton Rouge, Louisiana, United States, 70808
      • Pennington Biomedical Research Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 12 years to 18 years (Child, Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• boy or girl of any race
• age between 12 and 18 years
• willingness to use the RFPM/SmartIntake app for 3 days, in addition to a 1-2 day run-in period
• willingness to be responsive to study staff when prompted for additional information when using the RFPM/SmartIntake app
• parental support of the project, except for 18-year-olds

Exclusion Criteria:

• Individuals may not qualify for this study based on other eligibility criteria not listed. The study coordinator determine this on a case-by-case basis

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Other: Study sample; Individuals who participate in this validation study

Other: Tests of the validity of the RFPM and SmartIntake app.; Participants who enroll will be trained in using the RFPM/SmartIntake app and a food record and will complete the Food Intake Assessment Preference Survey. They will also use both methods to estimate intake during a simulated lab-based meal (they will not eat during this simulated meal). They will be dosed with DLW at this visit and will use the RFPM for the subsequent 1-2 days to get accustomed to using the method, with the following three days comprising the data collection period.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Equivalence between energy intake (kcal/day) measured with the RFPM and DLW	Energy intake is measured by the RFPM and DLW in kcal per day over 3 days. We will use the mean of the 3 days in the analyses. Two one-sided paired t-tests (α = 0.05 for each) will be performed in this pilot with equivalence bounds at 2% increments between 8% and 34% to determine equivalence in kcal estimates between RFPM and DLW.	3 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Mean difference between the RFPM and DLW on kcal/day	RFPM - DLW (kcal), with each method measuring energy intake over three days, and the mean of the three days for each method being included in the calculations and analyses.	3 days
Mean percentage error of RFPM relative to DLW	MPE = (RFPM - DLW) / DLW × 100	3 days

Collaborators and Investigators

• Sponsor: Pennington Biomedical Research Center
• Investigators: Principal Investigator: Corby K Martin, PhD, Pennington Biomedical Research Center

Study record dates

Study Major Dates

• Study Start (Actual): October 1, 2020
• Primary Completion (Actual): April 17, 2023
• Study Completion (Estimated): December 31, 2024

Study Registration Dates

• First Submitted: October 28, 2019
• First Submitted That Met QC Criteria: October 30, 2019
• First Posted (Actual): November 1, 2019

Study Record Updates

• Last Update Posted (Actual): March 12, 2024
• Last Update Submitted That Met QC Criteria: March 10, 2024
• Last Verified: March 1, 2024

More Information

Terms related to this study

• Other Study ID Numbers: PBRC 2019-053

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: Access to individual de-identified data is possible via Pennington Biomedical Research Center's Data Sharing policy.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No