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Objective: To investigate the factors affecting a healthy diet in patients with gastric cancer. Methods: Data from 146 consecutive patients with gastric cancer were collected based on the integrated model for behavior change. Core theory constructs were operationalized with decisional balance on a healthy diet, self-efficacy in fruit and vegetable (F&V) intake and diet planning, coping planning and self-leadership, and stages of change in F&V intake and adhering to a diet plan. Results: Higher self-efficacy in F&V intake and diet planning were associated with a higher readiness for change in F&V intake (adjusted odds ratio [aOR] for self-efficacy, 1.02; 95% confidence interval [CI], 1.01-1.04) and for adhering to a diet plan (aOR for self-efficacy, 1.02; 95% CI, 1.01-1.04; aOR for diet planning, 1.02; 95% CI, 1.01-1.04). Coping planning was a determinant of readiness for change in F&V intake (aOR, 1.02; 95% CI, 1.01-1.04). Self-leadership in behavioral awareness and volition (aOR, 1.02; 95% CI, 1.01-1.03) and task motivation (aOR, 1.02; 95% CI, 1.00-1.03) were determinants of readiness for change in adhering to a diet plan. Conclusions: Self-efficacy and coping planning were determinants of readiness for change in F&V intake in patients with gastric cancer. Self-efficacy and self-leadership were determinants of readiness for change in adhering to a diet plan in patients with gastric cancer. Improving self-efficacy, coping planning, and self-leadership is essential for changing behaviors to adopt a healthy diet. Nurses caring for patients with gastric cancer should identify strategies that improve self-efficacy in F&V intake and diet planning.
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