The mediterranean diet: From intention to behavior the role of multidimensional perceived social support (MPSS)

Abstract

This study examined how the Mediterranean Diet (MD) relates to constructs from the Theory of Planned Behavior (TPB) and to Multidimensional Perceived Social Support (MPSS). Using convenience sampling, adults aged 18–50 years were recruited from Turkey’s seven most populous provinces (Istanbul, Ankara, İzmir, Bursa, Antalya, Muğla, Aydın). In total, 391 participants completed a Likert-type online questionnaire. Pearson correlations and independent-samples t-tests were conducted. MPSS showed small-to-moderate positive associations with behavioral intention, attitude, and perceived behavioral control (PBC) (r≈.10–.18, p<.05/.01). Subjective norm and PBC were strongly correlated (r=.565, p<.001) and each related moderately to attitude (r=.344–.346, p<.001). No statistically significant differences were observed across the five constructs between participants who had applied the MD and those who had not (p>.05; η²=.001–.009). Overall, the pattern is consistent with TPB and suggests that strengthening perceived social approval and “can-do” control beliefs—especially when paired with regular, diet-specific support—may help translate intention into actual MD behavior.