MetabolismBeta-Hydroxybutyrate (BHB)/ BAY-tuh hy-drok-see-BYOO-tuh-rayt /The most abundant ketone body, produced by the liver from fat during fasting and used as fuel. Related Terms Adipose TissueMETABOLISM Basal Metabolic Rate (BMR)METABOLISM CatabolismMETABOLISM Circadian RhythmMETABOLISM