PortionSize Study 2 Free-Living Evaluation

NCT05166226 | Active Not Recruiting Results

• 1 other identifier: PBRC 2019-061
• Study Type: observational
• Target: 45
• Locations: 1 country
• Sites: 1

Brief Summary

The objective is to test the accuracy of the PortionSize™ app and the MyFitnessPal© app at measuring energy and nutrient intake in free-living conditions. Participants will use PortionSize™ and MyFitnessPal apps in separate periods to test the accuracy of the respective apps.

Conditions

Dietary Habits

Outcome Measures

Primary Outcomes (1)

• Energy (Kilocalorie or kcal) Intake

  The primary analyses assessing equivalence between PortionSize™ and the criterion measure (and MyFitnessPal and the criterion measures) will rely on equivalence testing using the Two One-side T-test (TOST) method. The null hypothesis of an equivalence tests is that the means are nonequivalent, i.e., the confidence interval of the mean of the test condition exceeds the pre-specified error bound. The alternative hypothesis is that the means are equivalent, and the mean difference between the experimental method and gold standard is hypothesized to be zero. Differences in error from PortionSize™ compared to error from MyFitnessPal will be assessed using dependent samples t-tests, with error calculated as the difference between each experimental method and the criterion variable (e.g., energy intake values from PortionSize™ minus energy intake values from weighed foods). These procedures will also produce results indicating if the error from each method differs from zero.

  Mean daily energy intake averaged across 3 day free-living period of each PortionSize app and MyFitnessPal app intervention.

Eligibility Criteria

• Age: 18 Years - 62 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

Healthy participants ages 18 to 62 in the Baton Rouge, LA area

You may qualify if:

• Male or female, age 18-62 years
• Body mass index (BMI) 18.5-50 kg/m2
• Subjects who are capable of giving informed consent and complying with all study procedures/requirements.
• Ownership of an iPhone model 6s or later, which the participant is willing to use for the study
• Access to Apple ID, password, and email address and willing to use them during the study
• Willing to use data and any accompanying charges as part of study participation
• Willing to complete all study procedures and adhere to study visit timelines
• Willing to be re-contacted for future research and/or follow-up

You may not qualify if:

• Active cancer diagnosis (excluding some melanomas)
• Have been 6-month weight unstable (gain/loss \>10 lbs in last 6 months)
• Undergoing weight loss treatment
• PBRC employee, as previous reviewers argued that they are not representative of the community
• Women who are currently pregnant or breastfeeding (self-reported)
• Diagnosed with an uncontrolled thyroid disorder (controlled = 3 months of medication)
• Have had or plan to have weight loss surgery (gastric band removal may be allowed at PI discretion)
• Allergic to or unwilling to eat study foods provided (exceptions made at the discretion of the PI)
• Consume \>28 alcoholic beverages per week
• Anyone severely immunocompromised
• Any condition or circumstance that in the judgement of the PI could interfere with study participation

Sponsors & Collaborators

• Pennington Biomedical Research Center: lead

Study Sites (1)

Pennington Biomedical Research Center

Baton Rouge, Louisiana, 70808, United States

Location

Related Publications (1)

• Diktas HE, Lozano CP, Saha S, Broyles ST, Martin CK, Apolzan JW. Validity of the PortionSize and MyFitnessPal Smartphone Applications for Estimating Dietary Intake: A Randomized Crossover Clinical Trial. J Nutr. 2025 Dec;155(12):4296-4306. doi: 10.1016/j.tjnut.2025.09.027. Epub 2025 Sep 27.

  PMID: 41022156 DERIVED

MeSH Terms

Conditions

Feeding Behavior

Condition Hierarchy (Ancestors)

Behavior, Animal; Behavior

Results Point of Contact

• Title: Dr. Corby Martin
• Organization: Pennington Biomedical Research Center

corby.martin@pbrc.edu

+1 (225) 763-2585

Study Officials

• Corby K Martin, PhD

  Pennington Biomedical Research Center

  PRINCIPAL INVESTIGATOR

• John W Apolzan, PhD

  Pennington Biomedical Research Center

  PRINCIPAL INVESTIGATOR

Publication Agreements

• PI is Sponsor Employee: No
• Restrictive Agreement: No

Study Design

• Study Type: observational
• Observational Model: CASE ONLY
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: PBRC Professor, Director - Ingestive Behavior Laboratory

Study Record Dates

• First Submitted: December 8, 2021
• First Posted: December 21, 2021
• Study Start: January 10, 2022
• Primary Completion: November 11, 2022
• Study Completion: December 31, 2025
• Last Updated: December 15, 2025
• Results First Posted: December 15, 2025

Record last verified: 2025-11

Locations

US (1)