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Longitudinal Research

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...

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Errors as a Means of Reducing Impulsive Food Choice

Errors as a Means of Reducing Impulsive Food Choice

Published on: June 5, 2016

Decaying behavioral effects in a randomized, multi-year fruit and vegetable intake intervention.

Jessica A Hoffman¹, Douglas R Thompson, Debra L Franko

¹Northeastern University. j.hoffman@neu.edu

Preventive Medicine

|March 5, 2011

Summary

This summary is machine-generated.

A school intervention initially increased children's fruit and vegetable intake, but the positive effects on consumption faded over time. Knowledge gains persisted, but preferences and body mass index remained unchanged.

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Published on: February 19, 2021

Area of Science:

Childhood Nutrition
Public Health Interventions
Behavioral Science

Background:

Childhood obesity is a significant public health concern.
Dietary habits established in childhood often persist into adulthood.
School-based interventions are a common strategy to promote healthy eating in children.

Purpose of the Study:

To evaluate a multi-component, theory-based intervention designed to improve children's fruit and vegetable consumption.
To assess the intervention's impact on fruit and vegetable preferences, knowledge, and body mass index (BMI).

Main Methods:

A 2.5-year randomized controlled trial involving 297 elementary school children in the Northeastern United States.
Intervention and control groups were compared across five assessment points over 3.5 years.
Hierarchical linear modeling was used to analyze changes in fruit and vegetable intake, preferences, knowledge, and BMI.

Main Results:

The intervention group showed an initial increase in fruit and vegetable consumption (0.28 servings/lunch) compared to the control group.
Behavioral effects on consumption declined over time, with no significant difference at the one-year follow-up.
Persistent positive effects were observed for children's knowledge regarding fruits and vegetables; no effects on preferences or BMI were found.

Conclusions:

While the school-based intervention produced initial improvements in fruit and vegetable consumption, these behavioral changes were not sustained long-term.
The findings highlight the challenges in maintaining dietary behavior change in school settings and suggest a need for ongoing or modified intervention strategies.
Further research is needed to optimize the design and duration of school-based nutrition programs to achieve lasting effects.