Building an efficient engine should be the goal of any one.  One important concept in the Fat as a fuel is the role of Ketones: ” Source: http://www.ketogenic-diet-resource.com/ketones.html After a few weeks of keto-adaptation, the muscles convert most of the acetoacetate type ketone body into beta-hydroxybutyrate (BHB) and return it to circulation, as the brain prefers to utilize BHB for …