Perceived behavioural control, unrealistic optimism and dietary change: an exploratory study

Area of Science:

• Health Psychology
• Behavioral Science
• Nutrition Psychology

Background:

• Dietary changes are crucial for health, yet adherence is challenging.
• Understanding psychological factors influencing dietary choices is vital for effective health promotion.
• The theory of planned behavior provides a framework for predicting behavior, but may need extensions to fully capture dietary choices.

Purpose of the Study:

• To assess the applicability of the theory of planned behavior to dietary fat reduction.
• To investigate the phenomenon of "unrealistic optimism" regarding diet-related health risks.
• To examine the role of "self-identity" in relation to dietary behavior and health concerns.

Main Methods:

• A questionnaire was developed incorporating the theory of planned behavior, a "self-identity" measure, and assessment of "unrealistic optimism" regarding diet.
• Data were collected from 612 members of the general public across three UK locations.
• Statistical analyses were used to examine the relationships between psychological variables and dietary behavior.

Main Results:

• The study found partial support for the applicability of the theory of planned behavior in predicting dietary changes.
• "Self-identity" emerged as an independent predictor of dietary behavior.
• Evidence of "unrealistic optimism" was observed, with individuals exhibiting greater optimism showing lower estimates of "unhealthy" food consumption.

Conclusions:

• Psychological factors, including the theory of planned behavior and "self-identity," play a role in dietary choices.
• The presence of "unrealistic optimism" suggests a need for tailored health promotion strategies that address cognitive biases.
• Findings have implications for designing interventions to promote healthier eating habits and reduce fat consumption.