Study of Dietary Intervention Under 100 MMOL in Heart Failure

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.