Excessive red meat consumption poses a significant challenge to both public health and environmental sustainability. This thesis aims to investigate the psychological determinants of consuming one portion of red meat per week, using the Theory of Planned Behavior (TPB; Ajzen, 1991) as a theoretical framework, extended with selfidentity as a redmeat eater and past readmeat consumption behavior. The research adopted a perspective design carried out in two waves (T1 and T2) conducted one month apart. At T1, the constructs of the extended TPB were measured, including both cognitive and affective dimensions of attitude; at T2, the participants' selfreported consumption of red meat portions over the previous month was recorded. The convenience sample consisted of 380 omnivorous Italian adults (mean age = 43.8 years), 39.5% of whom were women. The regression analyses show that the extended model accounts for 52% of the variance in intention and 52% of the variance in the behavior reported at T2. Perceived behavioral control and affective attitude emerged as the strongest predictors of intention. Selfidentity was not associated with intention, controlling for past behavior. For selfreported behavior at T2, the strongest predictors were past behavior, selfidentity, and perceived behavioral control. Consistent with literature, women exhibited a higher intention to limit red meat consumption and reported lower actual consumption compared to men. This study offers insights for designing interventions targeting adults, indicating that strategies should aim to increase the perceived ease of limiting meat intake and to disrupt established dietary routines, particularly among male consumers.
Il consumo eccessivo di carne rossa rappresenta una sfida per la salute pubblica e per la sostenibilità ambientale. L’elaborato finale ha lo scopo di indagare le determinanti psicologiche del consumo di una porzione a settimana di carne rossa, utilizzando come cornice teorica la Teoria del Comportamento Pianificato (Theory of Planned Behaviour, TPB; Ajzen, 1991) estesa con la self-identity come persona che mangia la carne rossa e il comportamento passato di consumo di carne rossa. La ricerca ha adottato un disegno prospettico svolto in due fasi (T1 e T2) a distanza di un mese l’una dall’altra. Al T1 sono stati misurati i costrutti della TPB estesa, considerando anche due dimensioni dell’atteggiamento (cognitivo e affettivo); al T2 è stato rilevato il consumo auto-riportato di porzioni di carne rossa nel corso del mese precedente la somministrazione del secondo questionario. Il campione di convenienza è composto da 380 adulti italiani onnivori (età media 43.8 anni), di cui il 39.5% donne. I risultati delle analisi di regressione indicano che il modello spiega complessivamente il 52% della varianza dell’intenzione e di quella del comportamento riportato al T2. I predittori più forti dell’intenzione sono il controllo comportamentale percepito e l’atteggiamento affettivo. La self-identity non è associata all’intenzione, dopo aver controllato l’effetto del comportamento passato. I predittori più importati del comportamento al T2 sono il comportamento passato, la self-identity e il controllo comportamentale percepito. Coerentemente con la letteratura, le donne mostrano un’intenzione più elevata di limitare il consumo di carne rossa e un consumo auto-riportato di carne rossa più basso rispetto agli uomini. Lo studio fornisce indicazioni utili per la progettazione di interventi rivolti agli adulti che dovrebbero concentrarsi sulla facilità percepita dell’azione di limitare il consumo di carne e sul cambiamento delle routine alimentari, soprattutto nel caso degli uomini.
Self-identity e scelte alimentari. Uno studio sulla Teoria del comportamento pianificato applicata al consumo della carne
MARCHESI, MARICA
2025/2026
Abstract
Excessive red meat consumption poses a significant challenge to both public health and environmental sustainability. This thesis aims to investigate the psychological determinants of consuming one portion of red meat per week, using the Theory of Planned Behavior (TPB; Ajzen, 1991) as a theoretical framework, extended with selfidentity as a redmeat eater and past readmeat consumption behavior. The research adopted a perspective design carried out in two waves (T1 and T2) conducted one month apart. At T1, the constructs of the extended TPB were measured, including both cognitive and affective dimensions of attitude; at T2, the participants' selfreported consumption of red meat portions over the previous month was recorded. The convenience sample consisted of 380 omnivorous Italian adults (mean age = 43.8 years), 39.5% of whom were women. The regression analyses show that the extended model accounts for 52% of the variance in intention and 52% of the variance in the behavior reported at T2. Perceived behavioral control and affective attitude emerged as the strongest predictors of intention. Selfidentity was not associated with intention, controlling for past behavior. For selfreported behavior at T2, the strongest predictors were past behavior, selfidentity, and perceived behavioral control. Consistent with literature, women exhibited a higher intention to limit red meat consumption and reported lower actual consumption compared to men. This study offers insights for designing interventions targeting adults, indicating that strategies should aim to increase the perceived ease of limiting meat intake and to disrupt established dietary routines, particularly among male consumers.| File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/109743