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Although glucose is the main source of fuel for most people, these fatty acids are used by the brain cells when carbohydrate or food intake is low. In simpler terms, since you have no more glucose or glycogen, ketosis kicks in and your body will use your stored/consumed fat as energy.Ketosis is pretty amazing, and in fact, gets even better. Studies show that the body and brain actually prefer using ketones, being able to run 70% more efficiently than glucose. From an evolutionary standpoint, this makes perfect sense.Our ancestors didn’t always have access to food, and they certainly didn’t always have access to glucose. Their body was feasting on the fat from the last woolly mammoth or saber-toothed tiger.So, How Does Ketosis Work?When fat is broken down by the liver, glycerol and fatty acid molecules are released. The fatty acid is broken down further, in a process called ketogenesis, and a ketone body called acetoacetate is produced.Acetoacetate is then converted into 2 other types of ketone bodies:Beta-hydroxybutyrate (BHB) – After being keto-adapted for a while, your muscles will convert the acetoacetate into BHB as it’s preferred by the brain as fuel.Acetone – Can sometimes be metabolized into glucose, but is mostly excreted as waste. This gives the distinct smelly breath that most ketogenic dieters know.
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