Synergistic effects of social support and self-efficacy on dietary motivation predicting fruit and vegetable intake.

Auteur(s) :
Knoll N., Schwarzer R., Reyes Fernández B., Warner LM., Montenegro-Montenegro E.
Date :
Jan, 2015
Source(s) :
Appetite. # p
Adresse :
Freie Universität Berlin, Germany; Universidad de Costa Rica, Costa Rica. Electronic address:

Sommaire de l'article


Self-efficacy and social support are considered relevant predictors of fruit and vegetable intake. This study examines whether the effect of self-efficacy on fruit and vegetable intake is mediated by intention and whether this motivational process is moderated by received dietary social support.


A longitudinal study with two measurement points in time, four weeks apart, on fruit and vegetable intake was carried out with 473 students aged 19 years on average (52% women). In a conditional process analysis, dietary intention was specified as a mediator between self-efficacy and fruit and vegetable intake, whereas received dietary support was specified as a moderator of the self-efficacy-intention association, controlling for baseline fruit and vegetable intake.


Self-efficacy was positively associated with fruit and vegetable intake four weeks later, and intention mediated this process. Moreover, an interaction between received dietary support and self-efficacy on intention emerged.


The effect of self-efficacy on fruit and vegetable intake was fully mediated by intention. Moreover, received support exhibited a moderating role within the motivational process: high dietary support appeared to accentuate the positive relationship between self-efficacy and dietary intention.

Source : Pubmed