Fast Induced Remodeling in Heart Failure With Preserved Ejection Fraction

This study tests whether short-term supervised fasting (calorie restriction) can help improve heart function in people with heart failure with preserved ejection fraction (HFpEF) — a type of heart failure where the heart pumps normally but the muscle is too stiff to fill properly, often linked to obesity and metabolic problems. **You may be eligible if...** - You have been diagnosed with HFpEF (heart pumping fraction of 55% or more) - Your heart failure symptoms are mild to moderate (NYHA Class I to III) - You have been stable on heart failure medications for at least 1 month - You are medically appropriate for a supervised dietary intervention **You may NOT be eligible if...** - You have a different type of heart failure (pumping fraction below 55%) - You have uncontrolled diabetes that would make supervised fasting unsafe - You have been hospitalized for heart failure very recently - You have serious kidney, liver, or other organ problems Talk to your doctor to see if this trial is right for you.