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The Fruit and Vegetable Study

This study has been completed.
Information provided by (Responsible Party):
Zora Djuric, University of Michigan Identifier:
First received: April 30, 2007
Last updated: December 19, 2012
Last verified: November 2008
The main aim of this study is to determine if persons can increase fruit and vegetable intakes if they make a specific plan to do so.

Condition Intervention
Behavioral: written materials only
Behavioral: written materials
Behavioral: telephone support

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Prevention
Official Title: Implementation Intentions for Improving Fruit and Vegetable Intakes

Further study details as provided by Zora Djuric, University of Michigan:

Primary Outcome Measures:
  • Document enrollment success at a primary care clinic [ Time Frame: 8 months ]

Secondary Outcome Measures:
  • Determine change in fruit and vegetable consumption [ Time Frame: 3 months ]

Enrollment: 97
Study Start Date: September 2006
Study Completion Date: June 2008
Primary Completion Date: September 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 1
written materials only
Behavioral: written materials only
related to fruit/vegetable servings/day
Other Name: control
Experimental: 2
written materials plus asked to form implementation intentions
Behavioral: written materials
related to fruit/vegetable servings/day
Other Name: asked to form implementation intentions
Experimental: 3
same as arm 2 plus telephone support
Behavioral: telephone support
related to fruit/vegetable servings/day
Other Name: written plus telephone

Detailed Description:
The conduct of cancer prevention trials through community settings and/or national networks of clinical sites requires the development of appropriate interventions. One promising behavioral strategy that is very simple to administer is that of the formulation of implementation intentions. The premise of this intervention is that once persons formulate a plan of action, automatic behavior follows. Use of this intervention in primary care is an innovative approach to eliciting preventive behaviors with minimal staff time. The goal in this study will be to increase fruit and vegetable consumption by 2 servings/day without a change in overall energy intakes by decreasing consumption of a less nutritious food. Substitution of foods is critical for prevention of weight gain. This feasibility study aims conduct a randomized, controlled clinical trial to test whether formulation of implementation intentions, either alone or with telephone support, can increase fruit and vegetable consumption without an increase in overall energy intakes. Recruitment success in a family medicine clinic in Ypsilanti Michigan will be documented with emphasis on the extent of minority participation. Dietary assessment will be the main outcome variable. Other assessments will include demographics, self-assessment of behaviors targeted by the intervention and levels of carotenoids in plasma. We will enroll 105 subjects to retain 28/arm, and power is good to detect small differences in fruit and vegetable intakes among the three study arms. This will generate useful data for the design of larger dietary intervention trials that are cost-effective and which will utilize multiple clinical sites to optimize enrollment.

Ages Eligible for Study:   40 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Age 40 and older
  • Give informed consent
  • In general good health
  • Less than 5.5 servings/day of fruits and vegetables

Exclusion Criteria:

  • On medically prescribed diets that the study would not be consistent with
  • Evidence of eating disorders
  • Health problems that affect energy needs (eg. broken leg can interfere with normal activities and affect energy needs).
  Contacts and Locations
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Please refer to this study by its identifier: NCT00468156

United States, Michigan
Ypsilanti Family Health Center
Ypsilanti, Michigan, United States, 48197
Sponsors and Collaborators
University of Michigan
Principal Investigator: Zora Djuric, PhD University of Michigan
  More Information

Responsible Party: Zora Djuric, Research Professor, University of Michigan Identifier: NCT00468156     History of Changes
Other Study ID Numbers: HUM00004225
Study First Received: April 30, 2007
Last Updated: December 19, 2012

Keywords provided by Zora Djuric, University of Michigan:
cancer risk processed this record on May 25, 2017