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Triglycerides are an enormous reservoir of energy (up to 135,000 kcal in a 70 kg individual). Triglycerides are hydrolyzed to fatty acids and glycerol by lipases enzymes. The release of the first fatty acid, the rate-limiting step, is catalized by a hormone-sensitive lipase that is reversibly phosphorylated. Triglycerides are continually being hydrolyzed and resynthesized in adipose cells. Glycerol derived from the hydrolysis is exported to the liver. Meanwhile, most of the fatty acids from the hidrolysis are reesterified if glycerol-3-phosphate is abundant, otherwise they are released in the plasma.

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