Portion Size and To-go Container on Dinner Intake

NCT ID: NCT03502096

Last Updated: 2018-04-18

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 58 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2016-10-31
• Study Completion Date: 2017-12-31

Brief Summary

This study investigated whether the provision of a to-go container influenced the portion size effect at a meal. Following a screening visit, women came to the lab once a week for 4 weeks to eat a meal of multiple foods. At each visit, the portion size of the meal was varied in a counterbalanced order. Prior to their first meal, women were randomly assigned to one of two groups: a group that would have their leftovers packaged to go (to-go group) and a group that did not have leftovers packaged (control group). Women were instructed to eat ad libitum at the meals. They also answered questions about hunger and fullness as well as food characteristics before and after each meal. Following the final meal, subjects completed a series of questionnaires assessing subject characteristics as well as food characteristics. It was hypothesized that the effect of portion size on intake would be attenuated in subjects who received a to-go container with the meal. In addition, we aimed to identify any subject characteristics that moderated or exacerbated the portion size effect. It was also of interest to determine whether the portion size effect on individual foods were influenced by food characteristics such as perceived value.

Conditions

Obesity; Eating Behavior

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: FACTORIAL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

100% portion size

100% portion sizes of all foods served (baseline). To-go container and controls received this meal.

Group Type: EXPERIMENTAL

To-Go container

Intervention Type: BEHAVIORAL

Subjects were provided a to-go container in which leftover foods would be packaged

Control

Intervention Type: OTHER

Subjects were not provided a to-go container with the meal

125% portion size

125% of baseline portions served. To-go container and controls received this meal.

Group Type: EXPERIMENTAL

To-Go container

Intervention Type: BEHAVIORAL

Subjects were provided a to-go container in which leftover foods would be packaged

Control

Intervention Type: OTHER

Subjects were not provided a to-go container with the meal

150% portion size

150% of baseline portions served. To-go container and controls received this meal.

Group Type: EXPERIMENTAL

To-Go container

Intervention Type: BEHAVIORAL

Subjects were provided a to-go container in which leftover foods would be packaged

Control

Intervention Type: OTHER

Subjects were not provided a to-go container with the meal

175% portion size

175% of baseline portions served. To-go container and controls received this meal.

Group Type: EXPERIMENTAL

To-Go container

Intervention Type: BEHAVIORAL

Subjects were provided a to-go container in which leftover foods would be packaged

Control

Intervention Type: OTHER

Subjects were not provided a to-go container with the meal

Interventions

To-Go container

Subjects were provided a to-go container in which leftover foods would be packaged

Intervention Type: BEHAVIORAL

Control

Subjects were not provided a to-go container with the meal

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Regularly eats 3 meals/day
• Willing to avoid alcohol the day before and during test days
• Likes foods offered at test meals
• Body mass index 18 - 36 (kg/m*m)

Exclusion Criteria

• Smokes
• Athlete in training
• Pregnant or breastfeeding
• Taking medication that may affect appetite or food intake
• Food allergies or dietary restrictions
• Currently have or recently been diagnosed with disease or disorder known to affect appetite

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 60 Years
• Eligible Sex: FEMALE
• Accepts Healthy Volunteers: No

Sponsors

United States Department of Agriculture (USDA)

FED

Sponsor Role: collaborator

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

NIH

Sponsor Role: collaborator

Jenny Craig, Inc.

INDUSTRY

Sponsor Role: collaborator

Penn State University

OTHER

Sponsor Role: lead

Responsible Party

Barbara J. Rolls

Professor of Nutrition and Director of the Laboratory for the Study of Human Ingestive Behavior

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Barbara J. Rolls, PhD

Role: PRINCIPAL_INVESTIGATOR

The Pennsylvania State University

Other Identifiers

R01DK059853

Identifier Type: NIH

Identifier Source: secondary_id

View Link

NIFA Grant 2011-67001-30117

Identifier Type: OTHER_GRANT

Identifier Source: secondary_id

PortionSize105

Identifier Type: -

Identifier Source: org_study_id