Dietary AssessmentFoodPhone2NCT04148560
Free-living Validation of the RFPM in Adolescents
A study testing Tests of the validity of the RFPM and SmartIntake app. in people with Dietary Assessment and Energy Intake, run by Pennington Biomedical Research Center at 1 site in United States.
Trial summary
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… Read more about this study
- Who is it for?
- Ages 12 to 18 yearsHealthy volunteers can take part
- Conditions the study is for
- Dietary Assessment, Energy Intake, Food Intake
- What is being tested?
- Tests of the validity of the RFPM and SmartIntake app.
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 29 participants
- Where
- 1 siteUnited States
- Study dates
- 1 Oct 2020to 31 Dec 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
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 12 to 18 years
- All sexes
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- 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
Who cannot join
- 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
Trial locations and contacts
1 site in 1 country.
United States1 site
Pennington Biomedical Research Center
Baton Rouge, Louisiana, 70808
About this study
Official title: 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.
Read the 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.
- Conditions
- Dietary Assessment, Energy Intake, Food Intake, Food Photography
- Being tested
- Tests of the validity of the RFPM and SmartIntake app.
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Tests of the validity of the RFPM and SmartIntake app.Other
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.
| Study group | Role | What they receive |
|---|---|---|
| Study sample | Other | Individuals who participate in this validation study Receives: Other: Tests of the validity of the RFPM and SmartIntake app. |
What is being measured
The primary outcome is the main question the study is designed to answer.
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.
Measured: 3 days
Secondary outcomes (2)
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.
Measured: 3 days
Mean percentage error of RFPM relative to DLW
MPE = (RFPM - DLW) / DLW × 100
Measured: 3 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted1 Nov 2019
- Study start1 Oct 2020
- Primary completion17 Apr 2023
- Study completion31 Dec 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Dietary AssessmentStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
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
- Other
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 29 participants (actual)
Sponsor and investigators
- Lead sponsor
- Pennington Biomedical Research Center
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Corby K. Martin, Pennington Biomedical Research Center
- Investigators
- Corby K Martin, PhD, Principal investigator, Pennington Biomedical Research Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04148560
- Sponsor's protocol ID
- PBRC 2019-053
- Acronym
- FoodPhone2
- Status last verified
- Apr 2026
- First submitted
- 28 Oct 2019
- Last updated
- 5 May 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Access to individual de-identified data is possible via Pennington Biomedical Research Center's Data Sharing policy.
Publications
Hochsmann C, Diktas HE, Myers CA, Dorling JL, Rood JC, Greenway F, Champagne CM, Apolzan JW, Martin CK. The validity of measuring energy and nutrient intake with the Remote Food Photography Method (RFPM) in adolescents. Am J Clin Nutr. 2026 Jul 25;124(3):101452. doi: 10.1016/j.ajcnut.2026.101452. Online ahead of print.
PubMed 42501948
Study at a glance
From the registry record, last updated by the sponsor on 5 May 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Validity of the Remote Food Photography Method to Measure Food Intake in Adolescents in Free-living Conditions
- ClinicalTrials.gov ID
- NCT04148560
- Acronym / sponsor ID
- FoodPhone2 / PBRC 2019-053
- Conditions
- Dietary Assessment, Energy Intake, Food Intake, Food Photography
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 29 participants (actual)
- Lead sponsor
- Pennington Biomedical Research CenterUniversity, hospital or other
- Study start
- 1 Oct 2020 (actual)
- Primary completion
- 17 Apr 2023 (actual)
- Study completion
- 31 Dec 2025 (actual)
- First posted
- 1 Nov 2019 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
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 design
- Primary purpose
- Other
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Study sample | Other | Other: Tests of the validity of the RFPM and SmartIntake app.Individuals who participate in this validation study |
Who may qualify
- Ages
- 12 to 18 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (5 listed)
- 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
Key exclusion criteria (1 listed)
- 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
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| 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. | Other | Study sample |
Primary outcome
Equivalence between energy intake (kcal/day) measured with the RFPM and DLW
Time frame: 3 days
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.
2 secondary outcomes
Mean difference between the RFPM and DLW on kcal/day
Time frame: 3 days
Mean percentage error of RFPM relative to DLW
Time frame: 3 days
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 5 May 2026.
- Derived from this study: PubMed 42501948Hochsmann C, Diktas HE, Myers CA, Dorling JL, Rood JC, Greenway F, Champagne CM, Apolzan JW, Martin CK. The validity of measuring energy and nutrient intake with the Remote Food Photography Method (RFPM) in adolescents. Am J Clin Nutr. 2026 Jul 25;124(3):101452. doi: 10.1016/j.ajcnut.2026.101452. Online ahead of print.
- Individual participant dataSharing planned: No. Access to individual de-identified data is possible via Pennington Biomedical Research Center's Data Sharing policy.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Corby K Martin, PhD principal investigator
Pennington Biomedical Research Center
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Tests of the validity of the RFPM and SmartIntake app. in people with Dietary Assessment and Energy Intake, run by Pennington Biomedical Research Center 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 1 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 5 May 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
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?
Equivalence between energy intake (kcal/day) measured with the RFPM and DLW (time frame: 3 days). 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 NCT04148560, which also lists 1 linked publication.
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 5 May 2026.