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Metabolic Energy Control

The metabolic energy control system of the human organism is designed to be fueled by either glucose (carbohydrates) or fatty acids (lipids).1, pp. 160  In a healthy individual, the fuel of choice is largely determined by diet composition and intake schedule.  Because food intake is a batch process for most people, the availability of food in the digestive system cycles daily through full, empty, full, and so forth.  Thus, for a diet in which the macronutrients (carbohydrates, proteins, and lipids) are consistent and in reasonable proportion, it is customary for the choice of fuel to switch back and forth seamlessly between glucose and fatty acids during the day in response to the alimentation cycles.
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Ketosis, Ketone Bodies, And Ketoacidosis – An Excerpt From Modern Nutritional Diseases, 2nd Edition

The cover or Modern Nutritional Diseases by Frank and Alice Ottoboni
Cover of the 1st Edition of Modern Nutritional Diseases by Frank and Alice Ottoboni
The following text is excerpted from Lipids (Chapter 8) of Modern Nutritional Diseases, 2nd Edition.

Ketone Bodies and Ketosis: Ketones are organic chemicals in which an interior carbon in a molecule forms a double bond with an oxygen molecule. Acetone, a familiar chemical, is the smallest ketone possible. It is composed of three carbons, with the double bond to oxygen on the middle carbon. Biological ketone bodies include acetone, larger ketones, and biochemicals that can become ketones. The most important of the ketone bodies are hydroxybutyrate and acetoacetate, both of which are formed from condensation of two acetyl CoA molecules. Acetone is formed from a nonenzymatic decarboxylation of acetoacetate.
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Why You Need To Stop Worrying About The Color Of Your Ketostix

Book cover for The Art And Science of Low Carbohydrate LivingYeah, I know you like to use them, but there are so many misconceptions about what they are telling you, that I need to intervene and make sure you get it.

But before I go there, let me urge you to just buy The Art and Science of Low Carbohydrate Living, and read pages 164-165.  Phinney and Volek have the best description of this that has probably ever been written, and you should really just read it from them. If I could copy these pages verbatim and paste it here, I would.  Seriously, it’s only a few bucks and it’s quite literally the book you want to own if you’re interested in low carb ketogenic diets.
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