This is a randomized, controlled, open-label, prospective, multicentre clinical trial designed to assess the effects of a nutritional intervention on morbidity and mortality in patients with chronic heart failure.

Through a simple 1:1 randomization process, patients will be assigned to the control group or the intervention group. Patients in the intervention group will undergo an individualised nutritional intervention program consisting of 3 pillars: diet optimization, specific recommendations ,and nutritional supplementation if nutritional targets are not achieved.

Inclusion Criteria:

• Patients older than 65 years with malnutrition (MNA-SF score ≤ 11) with chronic ambulatory heart failure (HF).

Exclusion Criteria:

• Admission for heart failure (HF) in the last month,
• Chronic renal failure on dialysis.
• Patients already on nutritional treatment.
• Concomitant diseases which, apart from the HF itself, could lead to a life expectancy of less than 1 year,
• Patients included in other clinical trials.
• Patients whose clinical situation makes it impossible to perform a nutritional assessment according to the design established in the study protocol or who do not give their consent for this purpose.
• Patients who during admission undergo surgical or percutaneous treatment to correct the cause of acute HF,