Well, in glucose metabolism, the glycolytic pathway breaks glucose into two molecules of pyruvate, which then is generates acetyl CoA. The acetyl CoA then enters the citric acid cycle and are oxidized to CO2.
In response to hormones like adrenaline, triacylglycerols (fats) are hydrolized in the cytosol to free fatty acids and glycerol. In the cytosol free fatty acids are esterified to coenzyme A to form a fatty acid CoA. In the mitochondrion, fatty acid CoA is converted to acetyl CoA which then enters the citric acid cycle just like in glucose metabolism.
The NADH and FADH2 formed during glucose metabolism is involved in making ATP from ADP and Pi in oxidative phosphorylation.
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