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Sodium restriction is the primary dietary therapy in heart failure (HF); however, assessing sodium intake is challenging to clinicians, who commonly rely on patients’ self-report of following a low-sodium diet to determine adherence. It is important to further explore the utility of self-reported adherence to a low-sodium diet in patients with HF.The objective of this study was to evaluate the association between patients’ self-reported adherence to a low-sodium diet and dietary habits related to sodium intake in patients with chronic HF.Patients with HF seen in a tertiary care Heart Function Clinic and who have been taught on a low-sodium diet with a target of less than 2300 mg/d were included. Self-perception of compliance and dietary habits related to sodium intake was evaluated by using a dietary questionnaire. Patients were divided into 3 groups according to self-reported adherence to a low-sodium diet: never, sometimes, and always.Overall, 237 patients (median age, 66 years, 72.6% men) were included. Compared with the other 2 groups, patients who stated always following a low-sodium diet were less likely to use salt in cooking or at the table. However, 4.2% of the patients in the always group reported eating canned or package soups every day. Moreover, the highest proportion of patients eating fast foods 1 to 3 times a week was found among those in the sometimes group (22.9%) compared with the never (9.1%) and always (6.7%) groups (P = .002). Importantly, the rest of the food items did not show any significant differences between self-reported adherence groups.Self-report of adherence to a low-sodium diet is not reliable among patients with HF, who associate the idea of following a low-sodium diet mainly with not using salt for cooking or at the table but not with reducing frequency of intake of high-sodium processed foods.