The Diet Self Efficacy Scale (DIET-SE)

Abstract

The Diet Self Efficacy Scale (DIET-SE) is an 11-item, scenario-based psychometric instrument developed by Christine Stich, Bärbel Knäuper, and Ami Tint (2009) to assess domain-specific self-efficacy in adhering to dietary regimens and resisting high-risk eating temptations. Grounded in Albert Bandura‘s Social Cognitive Theory, the DIET-SE evaluates individuals’ perceived capabilities to maintain dietary control across three ecologically valid situational dimensions: High Caloric Food Temptations (HCF; 4 items), Social and Internal Factors (SIF; 4 items), and Negative Emotional Events (NEE; 3 items). Items are administered via a standardized 5-point Likert-type response format capturing self-efficacy strength, ranging from 1 ("Not at all confident") to 5 ("Completely confident"). Psychometric evaluations demonstrate robust internal consistency, with total scale Cronbach’s alpha coefficients consistently ranging from α = .82 to .87 across clinical and non-clinical cohorts, and subscale reliabilities ranging from α = .70 to .79. Test-retest reliability across a two- to three-week interval is high (total scale r_tt = .83; subscales r_tt = .75 to .80). Confirmatory factor analyses corroborate the three-factor correlated model, which exhibits superior fit indices over unidimensional formulations. The scale displays strong convergent validity with established measures of weight control efficacy, eating pathology, and dietary adherence, as well as robust predictive validity regarding longitudinal weight regulation and behavioral resistance during laboratory-based food exposure paradigms. As a concise, brief, and diagnostically nuanced measurement tool, the DIET-SE is widely utilized in behavioral medicine, health psychology, clinical dietetics, and obesity intervention research.

Keywords

Diet Self Efficacy Scale, DIET-SE, self-efficacy, dietary adherence, weight loss maintenance, eating behavior, psychometrics, food temptations, emotional eating, social eating, self-regulation, Bärbel Knäuper.

Authors

The Diet Self Efficacy Scale (DIET-SE) was conceptualized, psychometrically validated, and published by a research team based at McGill University in Montreal, Quebec, Canada:

• Christine Stich, PhD — Department of Psychology, McGill University; specialist in health psychology, behavioral self-regulation, and public health interventions.
• Bärbel Knäuper, PhD — Professor of Psychology, Department of Psychology, McGill University; Director of the Health Psychology Laboratory; leading expert on self-regulation strategies, health behavior change, compensatory health beliefs, and questionnaire methodology.
• Ami Tint, PhD — Department of Psychology, McGill University; researcher focused on developmental and clinical behavioral assessment.

Correspondence regarding the original development of the instrument was directed to Dr. Bärbel Knäuper, Department of Psychology, McGill University, 1205 Dr. Penfield Avenue, Montreal, Quebec, Canada H3A 1B1.

Purpose

The primary purpose of the DIET-SE is to deliver an ecologically valid, psychometrically sound, and brief scenario-based assessment of an individual’s confidence in their ability to resist overeating and avoid dietary lapses across distinct relapse-inducing contexts. Dietary self-regulation represents a primary determinant of long-term weight management, the prevention of metabolic syndrome, and the clinical management of obesity. However, psychological research has consistently demonstrated that generalized self-efficacy scales fail to capture the contextual variability that characterizes dietary failure. Eating behaviors are triggered by diverse internal states and environmental stimuli, necessitating measurement instruments that evaluate situational self-efficacy.

Prior to the introduction of the DIET-SE, researchers frequently relied on broad instruments such as the 20-item Weight Efficacy Life-Style Questionnaire (WEL; Clark et al., 1991). While psychometrically valuable, existing instruments often imposed considerable response burden or contained generalized, decontextualized prompt structures that failed to elicit realistic cognitive and affective appraisals. Stich, Knäuper, and Tint (2009) engineered the DIET-SE to address these structural limitations by adopting a scenario-based methodology. By presenting respondents with concrete, vividly depicted vignettes reflecting authentic behavioral dilemmas (e.g., attending a celebratory dinner party, facing highly palatable foods when tired, or managing acute relational conflict), the scale minimizes abstract self-report biases and activates the specific self-regulatory cognitive schemas operative in real-world environments.

In clinical contexts, the DIET-SE serves several evaluative and diagnostic functions:

• Pre-Treatment Profiling: Identifying idiosyncratic risk profiles prior to bariatric surgery, pharmacotherapy, or intensive lifestyle interventions, enabling clinicians to tailor behavioral action plans to an individual’s specific points of vulnerability.
• Targeted Interventions: Assisting cognitive-behavioral therapists and registered dietitians in designing customized coping strategies (such as implementation intentions, stimulus control, and emotion-focused reappraisal) targeting high-risk caloric, social, or emotional triggers.
• Progress Monitoring: Serving as a repeated-measures tracking instrument to evaluate the growth of self-regulatory capacity across behavioral weight loss programs.
• Predictive Relapse Modeling: Serving as an empirical predictor of prospective weight regain, lapse frequency, and attrition in longitudinal weight control trials.

Psychological Construct

The DIET-SE operationalizes dieting self-efficacy: an individual’s subjective appraisal of their personal capability to execute behavioral self-control and adhere to caloric or nutritional targets when confronted with situational barriers. Dieting self-efficacy is not conceptualized as a monolithic or immutable trait; rather, it is a dynamic, multidimensional cognitive construct modulated by physiological urges, environmental cues, and affective states. The DIET-SE differentiates this construct into three correlated yet structurally distinct latent factors:

1. High Caloric Food Temptations (HCF)

The HCF dimension encompasses four items (Items 3, 6, 7, and 10) evaluating an individual’s perceived capability to resist eating foods characterized by high hedonic palatability, caloric density, and immediate sensory gratification (e.g., pastries, cake, and ice cream). This construct captures resistance against hedonic hunger and cue-induced cravings occurring in spontaneous, opportunistic settings (such as a coworker’s workplace celebration or an impromptu invitation to consume ice cream). Individuals scoring low on HCF demonstrate elevated susceptibility to external food cues, visual and olfactory food stimuli, and automatic approach-avoidance biases toward calorie-dense nutritional options.

2. Social and Internal Factors (SIF)

The SIF dimension comprises four items (Items 1, 2, 5, and 9) assessing self-efficacy in scenarios where physiological depletion (e.g., fatigue, prolonged fasting) interacts with normative social facilitation mechanisms. Social eating contexts inherently elevate caloric intake through social modeling, normative expectations of consumption, hospitality pressures, and the celebratory framing of food. Simultaneously, internal depletion states, such as returning home late from work exhausted and famished, tax executive functioning and executive self-control resources. SIF captures the complex interplay between internal depletion cues and social environments, identifying vulnerabilities to overeating when self-control resources are degraded or social pressures encourage excess intake.

3. Negative Emotional Events (NEE)

The NEE dimension contains three items (Items 4, 8, and 11) measuring self-efficacy in avoiding emotional eating during acute psychological distress, interpersonal conflict, anxiety, or depressive affect. This construct reflects the cognitive capacity to decouple emotional discomfort from the urge to consume food as a coping or affect-regulation mechanism. Low NEE self-efficacy reflects reliance on palatable food as a compensatory pharmacological soothe, capitalizing on the transient dopaminergic surge associated with sugar and fat consumption to alleviate emotional distress. High NEE efficacy, conversely, reflects the confidence to employ adaptive, non-food-related emotional coping mechanisms, such as interpersonal communication, physical activity, or cognitive reappraisal.

Theoretical Framework

The conceptual architecture of the DIET-SE integrates three foundational psychological paradigms: Bandura‘s Social Cognitive Theory, Marlatt and Gordon’s Relapse Prevention Model, and modern dual-process models of self-regulation.

Bandura’s Social Cognitive Theory and Self-Efficacy

According to Bandura’s (1977, 1997) social cognitive framework, human functioning is driven by reciprocal determinism involving cognitive, behavioral, and environmental influences. Within this model, perceived self-efficacy represents the primary cognitive mediator of behavioral persistence and performance. Bandura emphasized that self-efficacy beliefs are inherently domain-specific; generalized expectations of control fail to accurately predict task-specific performance under duress. Dietary self-regulation requires mastery over distinct neurobiological impulses, environmental temptations, and visceral urges. Consequently, the DIET-SE adheres to Bandura’s methodological guidelines for measuring self-efficacy by presenting clearly articulated situational barriers and assessing confidence in executing targeted alternative behaviors.

Marlatt and Gordon’s Relapse Prevention Model

The structural differentiation of the DIET-SE mirrors the situational taxonomy formulated in Marlatt and Gordon’s (1985) Relapse Prevention Model. Originally engineered for addictive behaviors and later extended to eating pathologies, this model posits that behavioral lapses occur when an individual encounters a high-risk situation without possessing or deploying adequate coping responses. Marlatt identified three primary high-risk triggers for relapse: negative emotional states, interpersonal conflict/social pressure, and direct exposure to target substance cues. The three subscales of the DIET-SE directly align with this taxonomy:

• NEE maps onto negative affective states and interpersonal discord;
• SIF reflects social pressures, interpersonal modeling, and combined internal vulnerabilities;
• HCF mirrors direct exposure to high-incentive substance cues.

Dual-Process and Ego-Depletion Models of Self-Regulation

The DIET-SE’s operationalization is further informed by modern cognitive science paradigms, specifically dual-process architectures (Strack & Deutsch, 2004) and the Strength Model of Self-Control (Baumeister et al., 2007). In dual-process theory, eating choices emerge from the dynamic competition between an automatic, hedonic, stimulus-driven impulsive system and an executive, goal-directed reflective system. High-caloric food exposure and emotional distress rapidly activate impulsive approach tendencies. The DIET-SE measures an individual’s conscious expectation that their reflective system can inhibit impulsive drives, maintain goal-directed intentions, and execute effortful self-control under varying conditions of cognitive and biological load.

Validity

The psychometric validity of the DIET-SE has been examined through rigorous evaluations of construct, convergent, discriminant, and criterion-related predictive validity across both general and clinical populations (Stich et al., 2009).

Construct and Factorial Validity

Construct validity was established through sequential exploratory and confirmatory factor analyses. The primary structural model confirmed that a three-factor oblique representation demonstrates clean construct separation. Item-to-factor loadings across validation cohorts consistently meet conservative psychometric thresholds (λ ≥ .50), with no significant cross-loadings, demonstrating structural integrity across diverse demographics.

Convergent Validity

Convergent validity has been established through strong, theoretically coherent correlations with established instruments measuring self-regulation, eating behavior, and psychological distress:

• Weight Efficacy Life-Style Questionnaire (WEL): The DIET-SE exhibits high, positive correlations with the WEL total score (r = .72 to .78, p < .001), corroborating that both scales tap into the core construct of eating self-efficacy while the DIET-SE provides a more concise, scenario-based metric.
• Eating Restraint and Intuitive Eating: The scale correlates moderately and positively with measures of flexible dietary restraint (r = .38 to .46) and the reliance on internal hunger/satiety cues as indexed by the Intuitive Eating Scale (IES-2).
• General Self-Efficacy (GSE): Moderate positive correlations are observed with the General Self-Efficacy Scale (r = .30 to .38), illustrating that while dieting self-efficacy shares variance with broad agency beliefs, it remains a distinct domain-specific entity.

Discriminant Validity

Discriminant validity has been demonstrated by showing that DIET-SE scores are distinct from unrelated psychological constructs:

• Emotional Distress Measures: When controlling for general trait anxiety (STAI) and depressive symptomology (BDI-II), the NEE subscale maintains unique variance in predicting eating-related self-control, confirming that it measures behavioral coping efficacy rather than broad affective distress.
• Social Desirability: Correlations with the Marlowe-Crowne Social Desirability Scale are non-significant to weak (r < .15), indicating that participant responses are largely free from social desirability biases.

Predictive and Criterion-Related Validity

The DIET-SE displays clinical and behavioral predictive validity:

• Prospective Weight Loss and Maintenance: Stich et al. (2009) and subsequent clinical longitudinal studies demonstrated that baseline and change scores on the DIET-SE significantly predict weight reduction trajectories over 6-month and 12-month follow-up windows, accounting for significant unique variance beyond baseline Body Mass Index (BMI).
• Laboratory Behavioral Paradigms: In behavioral exposure experiments, individuals with higher baseline HCF scores consume significantly fewer grams of palatable snack foods (e.g., potato chips, chocolates) during taste-test paradigms following exposure to sensory cues.
• Lapse Frequency: Ecological momentary assessment (EMA) studies show that higher momentary DIET-SE scores are associated with lower likelihood of subsequent dietary lapses throughout the day.

Reliability

The DIET-SE demonstrates strong reliability across internal consistency and temporal stability metrics in both healthy and clinical samples.

Internal Consistency

Across the development and validation samples reported by Stich, Knäuper, and Tint (2009), the DIET-SE achieved high internal consistency:

• Full Scale (DIET-SE Total): Cronbach’s alpha ranges from α = .82 to .87, reflecting strong overall scale homogeneity without indicator redundancy.
• High Caloric Food Temptations (HCF; 4 items): Cronbach’s alpha ranges from α = .70 to .77.
• Social and Internal Factors (SIF; 4 items): Cronbach’s alpha ranges from α = .71 to .79.
• Negative Emotional Events (NEE; 3 items): Cronbach’s alpha ranges from α = .75 to .79.

Subsequent psychometric translations and adaptations into other languages (e.g., German, Portuguese, Chinese) have yielded comparable coefficients, with total scale alphas consistently spanning .83 to .89 and subscale alphas remaining above .70.

Test-Retest Reliability and Temporal Stability

To evaluate temporal stability, Stich et al. (2009) administered the DIET-SE across a 2- to 3-week interval in a non-treatment sample. Test-retest reliability coefficients demonstrated high consistency over time:

• DIET-SE Total Scale: r_tt = .83
• High Caloric Food Temptations (HCF): r_tt = .75
• Social and Internal Factors (SIF): r_tt = .77
• Negative Emotional Events (NEE): r_tt = .80

These values indicate that in the absence of targeted cognitive-behavioral interventions or significant lifestyle disruptions, situational dieting self-efficacy exhibits stable trait-like baseline properties while remaining sensitive to therapeutic interventions.

Factor Analysis

The structural composition of the DIET-SE was developed through a two-phase analytical strategy incorporating both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA).

Exploratory Factor Analysis (EFA)

During scale development, an initial pool of scenario-based items was administered to adult community samples engaging in weight management. Principal Axis Factoring (PAF) and Maximum Likelihood extraction with oblique (Promax) rotation were conducted, given the theoretical assumption that situational self-efficacy domains are interrelated. Examination of scree plots, Kaiser’s criterion (eigenvalues > 1.0), and parallel analysis supported a three-factor solution accounting for the majority of the total variance:

• Factor 1 (HCF): Eigenvalue = 3.92; accounted for 35.6% of the variance; loaded primarily by items involving tempting, palatable foods.
• Factor 2 (SIF): Eigenvalue = 1.48; accounted for 13.5% of the variance; loaded by items depicting fatigue, hunger, and dinner invitations.
• Factor 3 (NEE): Eigenvalue = 1.15; accounted for 10.4% of the variance; loaded by items involving interpersonal conflict, anger, and anxiety.

All 11 retained items exhibited primary factor loadings exceeding .50, with minimal cross-loadings (≤ .20).

Confirmatory Factor Analysis (CFA)

To cross-validate the identified structure, CFA was performed on an independent validation cohort. The hypothesized three-factor correlated model was evaluated against competing structural alternatives, including a unidimensional (single-factor) model and an orthogonal three-factor model. The three-factor correlated model provided superior model fit:

• Comparative Fit Index (CFI): ≥ .95
• Tucker-Lewis Index (TLI): ≥ .93
• Root Mean Square Error of Approximation (RMSEA): .052 (90% CI [.034, .069])
• Standardized Root Mean Square Residual (SRMR): .044

Standardized factor loadings (λ) across all 11 items ranged between .52 and .84 (all p < .001). Inter-factor correlations were moderate to strong (ranging from r = .51 to .68), supporting the conceptualization of the DIET-SE as measuring three distinct, interacting facets of a broader self-regulatory construct.

Instrument / Measurement Tool

The DIET-SE is a self-administered, 11-item psychometric questionnaire designed for paper-and-pencil, computer-based, or mobile digital survey administration.

• Test Type: Self-report psychological scale / Scenario-based self-efficacy assessment
• Target Population: Adolescents and adults (ages 16 and older) undertaking weight management, participating in dietary interventions, or undergoing evaluation for disordered eating patterns
• Administration Format: Individual or group; paper-and-pencil, web-based survey, or mobile health (mHealth) applications
• Completion Time: Approximately 3 to 5 minutes
• Item Format: Detailed situational vignettes paired with standardized confidence prompts
• Number of Items: 11 items structured across three subscales:
  • High Caloric Food Temptations (HCF): Items 3, 6, 7, 10 (4 items)
  • Social and Internal Factors (SIF): Items 1, 2, 5, 9 (4 items)
  • Negative Emotional Events (NEE): Items 4, 8, 11 (3 items)
• Response Scale: Standard 5-point Likert-type scale evaluating subjective confidence/capability:
  • 1 = Not at all confident
  • 2 = Slightly confident
  • 3 = Moderately confident
  • 4 = Very confident
  • 5 = Completely confident
• Scoring Procedures:
  • Subscale Scores: Calculated either as the sum of responses within each subscale or as the mean score (sum divided by number of items), preserving the original 1-to-5 metric for clinical interpretability.
    • HCF Mean Score: (Item 3 + Item 6 + Item 7 + Item 10) / 4
    • SIF Mean Score: (Item 1 + Item 2 + Item 5 + Item 9) / 4
    • NEE Mean Score: (Item 4 + Item 8 + Item 11) / 3
  • Total Score: Calculated by summing all 11 items (range: 11 to 55) or averaging all 11 items (range: 1.0 to 5.0). There are no reverse-coded items.
  • Interpretation: Higher scores denote greater perceived self-efficacy and confidence to maintain dietary control in high-risk contexts. Mean subscale scores below 3.0 denote clinically meaningful vulnerabilities, suggesting targets for behavioral coping interventions.

Permissions & Fee and Test Year

The Diet Self Efficacy Scale (DIET-SE) was published in 2009 by Christine Stich, Bärbel Knäuper, and Ami Tint in the peer-reviewed journal Assessment. The instrument and its foundational psychometric data are copyrighted by SAGE Publications and the authors.

Licensing and Usage: The DIET-SE is accessible for academic research, educational instruction, and non-commercial clinical practice. Researchers and clinicians may utilize the scale items for empirical and evaluative investigations provided appropriate academic citation is maintained. Commercial applications, including integration into proprietary corporate digital health applications, commercial weight loss platforms, or fee-for-service diagnostic batteries, require prior written authorization and licensing agreements through SAGE Publications or Dr. Bärbel Knäuper.

References

• Bandura, A. (1977). Self-efficacy: Toward a unifying theory of behavioral change. Psychological Review, 84(2), 191–215. https://doi.org/10.1037/0033-295X.84.2.191
• Bandura, A. (1997). Self-efficacy: The exercise of control. W. H. Freeman and Company.
• Baumeister, R. F., Vohs, K. D., & Tice, D. M. (2007). The strength model of self-control. Current Directions in Psychological Science, 16(6), 351–355. https://doi.org/10.1111/j.1467-8721.2007.00534.x
• Clark, M. M., Abrams, D. B., Niaura, R. S., Eaton, C. A., & Rossi, J. S. (1991). Self-efficacy in weight management. Journal of Consulting and Clinical Psychology, 59(5), 739–744. https://doi.org/10.1037/0022-006X.59.5.739
• Marlatt, G. A., & Gordon, J. R. (Eds.). (1985). Relapse prevention: Maintenance strategies in the treatment of addictive behaviors. Guilford Press.
• Stich, C., Knäuper, B., & Tint, A. (2009). A scenario-based measure of dieting self-efficacy: The DIET-SE. Assessment, 16(1), 16–30. https://doi.org/10.1177/1073191108322000
• Strack, F., & Deutsch, R. (2004). Reflective and impulsive determinants of social behavior. Personality and Social Psychology Review, 8(3), 220–247. https://doi.org/10.1207/s15327957pspr0803_1

Items of the Scale