Now, once we form the acetyl units, they can then enter the citric acid cycle, and that can ultimately be used to generate high energy ATP molecules. So, once again, to summarize, the breakdown of fatty acids is an oxidative process that releases activated acetyl coenzyme A units, thereby shortening or decreasing the size of that hydrocarbon chain by two carbons. And once we form the activated Coenzyme A units, they can enter the citric acid cycle, where they're ultimately used to actually generate the high energy ATP molecules. Now, what about fatty acid synthesis? What if we actually want to synthesize fatty acids? Why would we want to synthesize fatty acids?