Lactate is used as a fuel - by everyone. It&#x27;s all actually really interesting: TCA cycle (a.k.a Krebs cycle) in the muscle <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Citric_acid_cycle" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Citric_acid_cycle</a> and kind of also Cory cycle (which involves the liver) <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cori_cycle" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cori_cycle</a>