PortionSize Study 3: Assessment in Free-living Conditions

NCT05906160 | Completed

• 1 other identifier: PBRC 2019-063
• Study Type: observational
• Target: 63
• 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 intake in free-living conditions, tested against the gold-standard, doubly labeled water. 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 Intake (kcal)

  Test the equivalence between PortionSize (and MyFitnessPal) and the criterion measure, which is energy intake assessed with DLW. These analyses will rely on equivalence testing using the Two One-side T-test (TOST) method, as well as Bland and Altman analyses.

  May 2023 through February 2025

Eligibility Criteria

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

Study Population

Adults aged 18-62, males and females.

You may qualify if:

• Male or female, age 18-62 years
• Body mass index (BMI) 18.5-50 kg/m2
• Ownership of an iPhone model 9 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:

• oHave been 6-month weight unstable (gain/loss \>5% last 6 months) and/or active weight loss program
• Any cardiometabolic disorder that significantly affects what or how much people eat
• Active cancer diagnosis or treatment that significantly affects what or how much people eat, excluding some melanomas and other cancers
• PBRC employee, as previous reviewers argued that they are not representative of the community (
• rd member of the same household to participate (i.e. the 1st and 2nd members of the household cannot participate simultaneously)
• 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)
• Consume \>28 alcoholic beverages per week
• Anyone severely immunocompromised
• Serious digestive disorders that significantly affect what or how much people eat Fluid imbalance and/or on diuretic
• Follows a diet mainly consisting of foods that study staff deems unquantifiable for this study (i.e., liquid supplements, gluten-free specialty items) or consumes a high quantity of specialty foods
• Any condition or circumstance that, in the judgement of the PIs, couldimpede study completion

Sponsors & Collaborators

• Pennington Biomedical Research Center: lead

Study Sites (1)

Pennington Biomedical Research Center

Baton Rouge, Louisiana, 70808, United States

Location

Biospecimen

Retention: SAMPLES WITH DNA

The study relies on urine samples, which contain a small amount of DNA that degrades after about 4 weeks. The study will not obtain or analyze any DNA related data. The urine will be analyzed to quantify energy expenditure and by extension energy intake.

MeSH Terms

Conditions

Feeding Behavior

Condition Hierarchy (Ancestors)

Behavior, Animal; Behavior

Study Officials

• John W Apolzan, Ph.D.

  Pennington Biomedical Research Center

  PRINCIPAL INVESTIGATOR

Study Design

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

Study Record Dates

• First Submitted: May 26, 2023
• First Posted: June 15, 2023
• Study Start: June 22, 2023
• Primary Completion: November 25, 2024
• Study Completion: March 31, 2026
• Last Updated: May 5, 2026

Record last verified: 2026-04

Locations

US (1)