The two-step journey of stored fat: BREAK (lipolysis in the fat cell) and BURN (beta-oxidation in muscle mitochondria), connected by albumin-bound bloodstream transport.
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From Lipolysis to Beta-Oxidation
Fat burning is a two-location process. Step one (BREAK) occurs in adipocytes: lipolysis releases free fatty acids from stored triglycerides under the action of HSL and ATGL. Step two (BURN) occurs in muscle and heart mitochondria: beta-oxidation breaks fatty acids into acetyl-CoA, which feeds the TCA cycle and ultimately produces ATP.
Between the two steps lies the bloodstream, where FFAs bind albumin for transport. If FFAs are not captured by oxidative tissue within 3-4 hours, the liver re-esterifies them back into triglycerides, undoing the work of lipolysis.
Lipolysis (BREAK): catecholamine-driven cAMP/PKA activation phosphorylates perilipin and HSL, exposing the lipid droplet surface and enabling the three-step hydrolysis sequence (ATGL: TG to DAG; HSL: DAG to MAG; MGL: MAG to glycerol + FFA). Three FFAs exit the cell and bind albumin in capillary plasma.
Transport: albumin carries 1-3 FFAs per molecule through circulation. Oxidative tissues (type I muscle fibers, cardiac muscle, liver) extract FFAs via FATP and CD36 transporters on their surface.
Beta-oxidation (BURN): after carnitine shuttle entry (CPT1 gate, the main regulated step), each beta-oxidation cycle removes two carbons as acetyl-CoA and yields FADH2 + NADH. A C16 palmitate yields 7 cycles + 8 acetyl-CoA = approximately 106 ATP equivalents.
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Source & accuracy
This from lipolysis to beta-oxidation is an editorial illustration built to represent the concept accurately. Where it shows figures, they are typical or representative values chosen to make the relationship clear, not a single underlying dataset. The diagram and its explainer are reviewed and maintained centrally, and updated over time as understanding improves.
Break: releasing fat from storage
The first stage happens inside the fat cell. Lipases, principally adipose triglyceride lipase (ATGL) and hormone-sensitive lipase (HSL), hydrolyze stored triglyceride into three free fatty acids and a glycerol backbone. The fatty acids are not water soluble, so they bind to albumin in the blood, which carries them to tissues that can use them for energy.
Burn: oxidizing fat in muscle mitochondria
In a tissue like muscle, fatty acids are activated to fatty acyl-CoA and ferried into the mitochondrion by the carnitine shuttle, in which CPT-1 is the key gatekeeping enzyme. Inside, beta-oxidation removes two carbons at a time to produce acetyl-CoA, NADH, and FADH2. Acetyl-CoA feeds the citric acid cycle and the reducing equivalents drive ATP synthesis.
These two stages must be coupled: fat released but not oxidized can be re-esterified back into storage. This describes a metabolic pathway, not a guaranteed fat-loss outcome. General educational information, not medical advice.
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