Intermittent Fasting as Possible Treatment for Heart Failure

Western-style diet often leads to food overconsumption, which triggers the development of comorbidities, such as obesity, insulin resistance, hypercholesterolemia, hypertriglyceridemia, type 2 diabetes, and heart failure (HF). Several studies suggest that intermittent fasting (IF) protects against the development of those morbidities. This study presents evidence of the beneficial effects of IF on HF. Based on the current evidence, we discuss the potential molecular mechanisms by which IF works and where liver ketone bodies (KBs) play important roles. There is evidence that IF promotes a metabolic switch in highly metabolic organs, such as the heart, which increases the use of KBs during fasting. However, besides their role as energy substrates, KBs participate in the signaling pathways that control the expression of genes involved in oxidative stress protection and metabolism. Several molecular factors, such as adenosine monophosphate-activated protein kinase (AMPK), peroxisome proliferatoractivated receptor, fibroblast growth factor 21 (FGF21), sirtuins, and nuclear factor erythroid 2-related factor 2 (Nrf2) are involved. Furthermore, IF appears to maintain circadian rhythm, which is essential for highly metabolically active organs. Finally, we highlight the important research topics that need to be pursued to improve current knowledge and strengthen the potential of IF as a preventive and therapeutic approach to HF.