Ketosis - Wikipedia, the free encyclopedia: "Metabolic pathways
Most medical resources regard ketosis as a physiological state associated with chronic starvation.[citation needed] Glucose is regarded as the preferred energy source for all cells in the body with ketosis being regarded as a crisis reaction of the body to a lack of carbohydrates in the diet. In recent years this viewpoint, both the body's preference for glucose and the dangers associated with ketosis, has been challenged by some doctors.[7][8][9]
Ketone bodies, from the breakdown of fatty acids to acetyl groups, are also produced during this state, and are burned throughout the body. Excess ketone bodies will slowly decarboxylate into acetone. That molecule is excreted in the breath and urine. When glycogen stores are not available in the cells (glycogen is primarily created when carbohydrates such as starch and sugar are consumed in the diet), fat (triacylglycerol) is cleaved to give 3 fatty acid chains and 1 glycerol molecule in a process called lipolysis"
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