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Background: Diet and physical activity are recommended for diabetes management.Evidence suggests theory-based interventions are more efficacious than non-theory approaches. This study aimed to test the short-term effectiveness of an integrated theoretical model-based intervention to encourage compliance for low-fat food consumption, carbohydrate counting and physical activity in adults with type 2 diabetes.Methods: A 4-week parallel randomised control trial was conducted in Iran. Data were collected using a self-report questionnaire at baseline and 8-weeks postintervention. This survey assessed the theory of planned behaviour (TPB) constructs of attitude, subjective norm (others' approval) and perceived behavioural control (PBC). We also assessed risk perceptions (motivational) and planning (volitional) from the health action process approach (HAPA). Furthermore, weight, body mass index, triglyceride (TG) and LDL-cholesterol were measured, with a sub-sample of participants providing haemoglobin A1c (HbA1c) assessments.Results: For both low-fat food consumption and physical activity, only planning revealed a significant improvement over time for intervention rather than control participants (F = 8.78, P ≤ .001 for low-fat vs F = 11.26, P ≤ .001 for physical activity).

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