This study aims to identify the relationship between a low-sodium diet and neurohormonal and clinical status in stable chronic HF patients.

Inclusion Criteria:

• Patients will be recruited from each research center if they are 18 years or older, with confirmed diagnosis of Heart Failure (including both those with a reduced and preserved systolic function), NYHA II-IV, and willing to sign informed consent.

Exclusion Criteria:

• Subjects will be excluded if they have severe hyponatremia (serum sodium <130 mmol/L)
• Renal failure (a glomerular filtration rate < 30 mL/min)
• Uncontrolled thyroid disorders
• Hepatic failure
• Implantable cardiac device (ICD or CRT) or myocardial revascularization procedures (coronary angioplasty and/or surgical revascularization) in the previous 3 months
• Uncontrolled atrial fibrillation or recurrent ventricular arrhythmias
• Malignancy, or with moderate-severe dementia.
• Patients will be excluded if, in the opinion of the investigator, another condition exists that would preclude dietary compliance or compliance with the protocol.