Portion Size Effects on Body Weight:Free Living Setting

Not Applicable

Completed

• Conditions: Portion Sizes
• Interventions: Other: portion size kcal of box lunch

• Registration Number: NCT01820403
• Lead Sponsor: University of Minnesota

Brief Summary

The study purpose was to evaluate the effects of portion sizes on body weight and energy intake in a free-living setting. 223 healthy adults were recruited from an urban worksite and randomized to one of four groups for a six-month period. The groups were: 1) 400 kcal box lunch; 2) 800 kcal box lunch; 3) 1600 kcal box lunch; or 4) no box lunch. Participants were required to pick up a box lunch every week day for six months. Control participants did not receive a box lunch and were instructed to eat their usual lunch. Participants were weighed and dietary intake measured at baseline, one, three and six months. It was hypothesized that at six months, participants in the 1600 kcal box lunch would gain more weight and have higher energy intake than those in the other groups.

Detailed Description

Not available

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2010-09
• Primary Completion: 2013-02
• Study Completion: 2013-02
• Study First Submitted: 2013-03-25
• Study First Submitted QC: 2013-03-25
• Study First Posted: 2013-03-28
• Status Verified: 2019-10
• Last Update Submitted: 2019-10-30
• Last Update Posted: 2019-11-01

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 233

Inclusion Criteria

• : 1) age 18-60 yrs; 2) nonsmoker; 3) fluent in English; 4) not taking medications that affect appetite or body weight; 5) work at the medical complex full time, including during the lunch hours; 6) not allergic to the foods in the study lunches; 7) willing to eat the foods in the study lunches [examples were provided of the types of foods]; 8) not currently on a diet to lose weight; 9) no history of a diagnosed eating disorder; 10) not moving from the area during the next six months; 11) not currently taking part in another research study; 12) not currently pregnant, nursing or pregnant in the last 12 months.

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Exclusion Criteria

if the person does not meet the criteria above

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
portion size medium	portion size kcal of box lunch	800 kcal box lunch was delivered each weekday to each participant at the worksite for a six month period.
portion size small	portion size kcal of box lunch	400 kcal box lunch was delivered each weekday to each participant at the worksite for a six month period.
portion size large	portion size kcal of box lunch	1600 kcal box lunch was delivered each weekday to each participant at the worksite for a six month period.

Primary Outcome Measures

Name	Time	Method
body weight change	six months	change in body weight from baseline to six months

Secondary Outcome Measures

Name	Time	Method
dietary energy intake	six months	change in energy intake from baseline to six months

Trial Locations

Locations (1)

University of Minnesota; 🇺🇸 Minneapolis, Minnesota, United States