Any doctors reading this?

Quick question for anyone who might know: I was thinking about anaerobic metabolism. Now what I understand is that in the lactate cycle the lactate is brought to the liver where is is recycled into glucose. My question is: where does the energy come from? I do understand that it comes from the ATP system, but is the ATP in the liver generated from glucose/glycogen, or from fat? Or does it depend, and if yes, on what?

This question is bugging me for a while and I would be really grateful for a brief answer and/or some references…

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