Overweight Clinical Trial
Official title:
Do Weight Status and the Level of Dietary Restraint Moderate the Relationship Between Package Unit Size and Food Intake?
The objective of this study is to determine the independent and combined effects of weight status and the level of dietary restraint on the relationship between package unit size and food intake.
The estimated prevalence of obesity among adults in 2007-2008 was 33.8% and the combined
estimated prevalence of overweight and obesity was 68.0% [1]. Although there are no clear
reasons for the current obesity epidemic, there is a general consensus that environmental
dietary factors, such as package unit size, encourage excessive food intake and positive
energy balance [2, 3]. It is believed that the package unit size of food indirectly
influences food intake by impacting the accuracy of consumption monitoring [2, 4]. Large
packages decrease the accuracy of consumption monitoring by making it difficult to assess how
many servings have been consumed in one sitting, while small single-serving packages can
increase the accuracy of consumption monitoring by providing a clear definition of what a
standard serving is and how much one has consumed [2, 4, 5]. Therefore, it has been proposed
that small, single-serving packages of snack foods may help reduce energy intake [4, 5]. To
date, limited studies have been conducted in this area and the results are inconsistent
[4-9]. Mixed results could be related to differences in participant variables, specifically
weight status and level of dietary restraint (a term that refers to the amount of control
exerted over food intake) [4, 9]. These individual characteristics may interact with food
package unit size to influence one's food intake [2, 4]. Overweight individuals or restrained
eaters may more closely monitor the volume of food they consume as compared to normal weight
or unrestrained eaters [4, 9]. The [smaller] size of food packaging may aid in monitoring
food consumption and thus, influence how much food is consumed in overweight and/or
restrained eaters [2, 4]. Therefore, the objective of this study is to determine if weight
status and the level of dietary restraint moderate the relationship between package unit size
and food intake.
Specific Aims:
1. Determine the effect of dietary restraint on the relationship between package unit size
and food intake.
2. Determine the effect of weight status on the relationship between package unit size and
food intake.
3. Determine the combined effect of weight status and dietary restraint on the relationship
between package unit size and food intake.
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