What is the liver considered to be in metabolism?

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In metabolism, the liver acts as the central hub where most nutrient processing and energy regulation happen. It receives nutrients from the gut via the portal vein and coordinates how glucose, fats, and proteins are used or stored. For carbohydrates, it keeps blood glucose stable by storing excess glucose as glycogen (glycogenesis) and by producing glucose when needed (gluconeogenesis). In lipid metabolism, it synthesizes and packages fats and lipoproteins, and it also participates in fatty acid oxidation and cholesterol production. For proteins, it handles amino acid metabolism, detoxifies ammonia by converting it to urea, and synthesizes essential plasma proteins like albumin and clotting factors. The liver also detoxifies drugs and toxins and processes bilirubin for bile excretion, linking digestion with metabolism. It stores certain vitamins and minerals and produces bile, which is essential for fat digestion. Because so many metabolic pathways converge there and it regulates systemic energy and substance balance, it’s best described as the central organ of metabolism.