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Sum of the reactions:
This is the overall process for fatty acid synthesis. Acetyl CoA for fatty acid synthesis comes mostly from glycolytic breakdown of glucose.
Glucose Yields Acetyl CoA -- Schematic
This process is somewhat roundabout.
Citrate can also be oxidized by the tricarboxylic acid cycle in the mitochondria to yield energy. Notice that the need first to form citrate, then to transport it to the cytoplasm and then split it in order to get acetyl CoA for fatty acid synthesis provides several points at which control over acetyl CoA availability can be exerted.