From HSL activating in the adipocyte to the beta-oxidation spiral in muscle mitochondria: the complete fat-burning pathway.
A free, animated lipolysis to beta-oxidation you can read here or embed on any website, from Scrollchart.
Lipolysis to Beta-Oxidation
Adrenaline trigger
Triglyceride (stored fat)
Free fatty acids (broken)
Beta-oxidation (burned)
The complete fat-burning pathway spans two organs and three membrane barriers. In the adipocyte, stored triglyceride is hydrolysed by the cooperative action of ATGL (adipose triglyceride lipase) and hormone-sensitive lipase (HSL). ATGL, the primary triacylglycerol lipase, generates diacylglycerol, which HSL then processes to monoacylglycerol; monoglyceride lipase completes the hydrolysis to glycerol and three free fatty acids.
The released FFA bind to albumin in the interstitial fluid and enter circulation. At the muscle or cardiac cell, FFA dissociate from albumin, cross the plasma membrane via fatty acid translocase (FAT/CD36) and FATP proteins, and are activated to acyl-CoA by long-chain acyl-CoA synthetase in the cytosol. Short- and medium-chain fatty acids can diffuse freely into mitochondria; long-chain fatty acids require the carnitine shuttle.
The CPT-1 (carnitine palmitoyltransferase 1) step is the major regulatory checkpoint for fat oxidation. It transfers the acyl group from acyl-CoA to carnitine, producing acylcarnitine, which is transported across the inner mitochondrial membrane by carnitine-acylcarnitine translocase. CPT-2 reconverts acylcarnitine to acyl-CoA inside the matrix. CPT-1 is inhibited by malonyl-CoA, a product of de-novo lipogenesis, creating a reciprocal relationship: when carbohydrate flux is high and malonyl-CoA is elevated, fat oxidation is suppressed.
Inside the mitochondrial matrix, the beta-oxidation spiral removes a two-carbon acetyl-CoA unit per turn via four sequential enzymatic steps (acyl-CoA dehydrogenase, enoyl-CoA hydratase, hydroxyacyl-CoA dehydrogenase, thiolase), producing NADH and FADH2 at each cycle. A 16-carbon palmitoyl-CoA undergoes seven cycles to generate eight acetyl-CoA, seven NADH, and seven FADH2, yielding approximately 106 ATP after oxidative phosphorylation.
Good for
Fat metabolism foundation content
Why fasting burns fat explanations
CPT-1 and carnitine supplement context
Source & accuracy
This 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.
Starting the release inside the fat cell
The pathway opens when hormone-sensitive lipase (HSL) is activated inside the adipocyte, working with adipose triglyceride lipase (ATGL) to dismantle stored triglyceride. Each triglyceride yields three free fatty acids and a glycerol. The fatty acids leave the cell and ride through the bloodstream bound to albumin, since they do not dissolve in plasma on their own.
The beta-oxidation spiral in the mitochondria
Once inside a muscle fiber, a fatty acid is tagged with coenzyme A and shuttled across the mitochondrial membranes by the carnitine system, with CPT-1 acting as the regulated entry point. Beta-oxidation then runs as a repeating four-reaction spiral that clips two carbons off the chain each pass, releasing acetyl-CoA along with NADH and FADH2. The acetyl-CoA feeds the citric acid cycle and the electron carriers drive ATP production.
Mobilizing fat and oxidizing it are separate steps, and fatty acids not burned can be re-stored, so this pathway describes a mechanism rather than a guaranteed result. General educational information, not medical advice.
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