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Showing 1–24 of 28 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Portion Sizes Clear all
Completed Not applicable Interventional

Effect of Portion-control Training on Food Intake

NCT02942589
View directory record Official record
Conditions
Feeding Behaviors
Interventions
Meal portion size
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 66 Years · Female only
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 23, 2016 · Synced Sep 5, 2026, 1:46 AM EDT
Withdrawn Not applicable Interventional

Effects of Variety and Portion Size on Meal Intake of Adults

NCT05152693
View directory record Official record
Conditions
Eating Behavior
Interventions
Low variety, High Variety, Small Portion Size, Large Portion Size, With Beverage, Without Beverage
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 65 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 9, 2021 · Synced Sep 5, 2026, 1:46 AM EDT
Withdrawn Not applicable Interventional

Combined Effects of Variety and Portion Size on Meal Intake of Women

NCT05177367
View directory record Official record
Conditions
Eating Behavior
Interventions
Sequential Variety, Simultaneous Variety, Single Food, Small portion, Large Portion
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 65 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 3, 2022 · Synced Sep 5, 2026, 1:46 AM EDT
Terminated Not applicable Interventional

Effects of Varying Portion Size and Palatability on Food Intake of Preschool Children

NCT03643250
View directory record Official record
Conditions
Feeding Behavior
Interventions
Smaller Portion Size and Standard Appeal (non-divided plate), Smaller Portion Size and Enhanced Appeal (divided plate), Larger Portion Size and Standard Appeal (non-divided plate), Larger Portion Size and Enhanced Appeal (divided plate), Smaller Portion Size and Standard Appeal (divided plate)
Other
Lead sponsor
Penn State University
Other
Eligibility
3 Years to 5 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 21, 2019 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Results available

Effect of Portion Size Over 5 Days in Preschool Children

NCT02963987
View directory record Official record
Conditions
Feeding Behavior
Interventions
Food and Beverage Portion Size
Other
Lead sponsor
Penn State University
Other
Eligibility
3 Years to 5 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
2
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 10, 2019 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Portion Size and Energy Density of a Single Meal in Preschool Children

NCT02299531
View directory record Official record
Conditions
Feeding Behaviors
Interventions
Varying meal energy density and portion size
Other
Lead sponsor
Penn State University
Other
Eligibility
3 Years to 6 Years
Enrollment
131 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2013
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 23, 2014 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Results available

Variations in Palatability and Portion Size of Vegetables on Meal Intake of Preschool Children

NCT03926065
View directory record Official record
Conditions
Feeding Behavior
Interventions
Plain Vegetables Served in 100% Portion Size, Plain Vegetables Served in 200% Portion Size, Enhanced Vegetables Served in 100% Portion Size, Enhanced Vegetables Served in 200% Portion Size
Other
Lead sponsor
Penn State University
Other
Eligibility
3 Years to 5 Years
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 24, 2020 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Varying the Energy Density and Portion Size of the Main Course After a First-course Salad

NCT01729390
View directory record Official record
Conditions
Obesity
Interventions
Energy density and portion size feeding study
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 45 Years · Female only
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 19, 2012 · Synced Sep 5, 2026, 1:46 AM EDT
Completed No phase listed Observational Results available

The PortionSize Smartphone App Pilot (PS Pilot)

NCT04494971
View directory record Official record
Conditions
Dietary Habits
Interventions
Not listed
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years to 65 Years
Enrollment
15 participants
Timeline
2020
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Nov 18, 2024 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional

Combined Effects of Sequential Variety and Portion Size on Meal Intake of Women

NCT05485168
View directory record Official record
Conditions
Eating Behavior
Interventions
Sequential Variety, Single-Food, Small Portion, Large Portion
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 65 Years · Female only
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 21, 2023 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional

The Influence of Satiation Measures on the Portion Size Effect

NCT03886428
View directory record Official record
Conditions
Feeding Behavior
Interventions
100% portion size, 125% portion size, 150% portion size, 175% portion size
Other
Lead sponsor
Penn State University
Other
Eligibility
18 Years to 70 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 12, 2020 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional

Effects of Portion Size of Multiple Items at a Meal on Food Intake of Adults

NCT02369588
View directory record Official record
Conditions
Feeding Behaviors
Interventions
Food portion size
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 45 Years · Female only
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 23, 2015 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Does Portion Size Influence Intake of Low-Energy-Dense Foods in Preschool-aged Children?

NCT00936507
View directory record Official record
Conditions
Caloric Intake
Interventions
Energy Density/Portion Size
Other
Lead sponsor
The University of Tennessee, Knoxville
Other
Eligibility
3 Years and older
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Knoxville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 4, 2018 · Synced Sep 5, 2026, 1:46 AM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Snack Food Reinforcement in Obese and Non-obese Women

NCT00837694
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
State University of New York at Buffalo
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
65 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jul 31, 2019 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Portion Size Effects on Body Weight:Free Living Setting

NCT01820403
View directory record Official record
Conditions
Portion Sizes
Interventions
portion size kcal of box lunch
Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 60 Years
Enrollment
233 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 31, 2019 · Synced Sep 5, 2026, 1:46 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Pilot Testing of Food Images in Children

NCT03338634
View directory record Official record
Conditions
Childhood Obesity, fMRI
Interventions
Not listed
Lead sponsor
Penn State University
Other
Eligibility
6 Years to 10 Years
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2023
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 4, 2022 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional

Portion Size Strategies for Management of Body Weight

NCT01474759
View directory record Official record
Conditions
Obesity
Interventions
Advice on diet, physical activity, and behavior change, Instruction in food portion size, Provision of pre-portioned foods, Advice on healthy eating for weight loss
Behavioral · Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 65 Years · Female only
Enrollment
186 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2015
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 14, 2015 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Validity of an AI-based Program to Identify Foods and Estimate Food Portion Size

NCT05343585
View directory record Official record
Conditions
Nutrition Assessment
Interventions
PortionSize AI
Device
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years to 62 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Nov 17, 2023 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Intake Promoting Effects of Large Portions in Children

NCT00436878
View directory record Official record
Conditions
Eating
Interventions
Food portion size
Behavioral
Lead sponsor
Temple University
Other
Eligibility
5 Years to 6 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2011
U.S. locations
2
States / cities
Philadelphia, Pennsylvania • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 11, 2018 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional

Combined Effects of Simultaneous Variety and Portion Size on Meal Intake of Women

NCT05266183
View directory record Official record
Conditions
Eating Behavior
Interventions
Simultaneous Variety, Single-Food, Small Portion, Large Portion
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 65 Years · Female only
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 9, 2022 · Synced Sep 5, 2026, 1:46 AM EDT
Terminated Not applicable Interventional

The Role of Satiety in the Effect of Portion Size on Intake

NCT03409601
View directory record Official record
Conditions
Feeding Behavior
Interventions
100% Portion Size, 125% Portion Size, 150% Portion Size, 175% Portion Size
Other
Lead sponsor
Penn State University
Other
Eligibility
20 Years to 65 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 17, 2019 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Changing Portion Size Descriptions in a Cafeteria

NCT06263621
View directory record Official record
Conditions
Food Selection, Obesity, Weight Gain, Food Preferences
Interventions
Intervention "Standard"
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
Not listed
Enrollment
101,481 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 10, 2024 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Feeding, Fun, and Families Study

NCT03646201
View directory record Official record
Conditions
Childhood Obesity
Interventions
FFF
Behavioral
Lead sponsor
Temple University
Other
Eligibility
18 Years and older · Female only
Enrollment
131 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 23, 2018 · Synced Sep 5, 2026, 1:46 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Liking of Snack Foods - Sub-Study 1

NCT00200213
View directory record Official record
Conditions
Eating Behavior, Obesity, Satiation
Interventions
portion or unportioned food
Behavioral
Lead sponsor
The Miriam Hospital
Other
Eligibility
18 Years to 50 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2005
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 19, 2005 · Synced Sep 5, 2026, 1:46 AM EDT