PortionSize Study 3: Assessment in Free-living Conditions

Completed

Conditions studied: Dietary Habits

In brief

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.

Key facts

Study ID

NCT05906160

Run by

Pennington Biomedical Research Center

People needed

63

Starts

2023-06-22

Expected to finish

2026-03-31

Last updated by the study team

2026-05-05

Who can join

Age: 18 and older, up to 62. Sex: any. Healthy volunteers: not accepted.

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 (
• 3rd 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

Where it is running

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

Full record on ClinicalTrials.gov

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