When too little dietary carbohydrate is available to meet energy needs, ketones arise as byproducts of partial fat metabolism.
Ketones are water-soluble compounds derived from fat produced by the human liver as part of physiological adaptations to carbohydrate shortages.
When liver glycogen is used up and therefore that glucose flow is compromised, the oxidation of fatty acids is very intense in the liver and as a consequence ketones begin to be produced.
These highly energetic molecules derived from the oxidation of fat (acetoacetate, beta hydroxybutyrate and acetone) are what make the body not run out of energy since the brain can use them for all its functions.
Therefore, we can conclude that ketones are produced in the human body as a by-product of fat metabolism to meet energy needs when the diet is low in carbohydrates and therefore there is an inadequate availability of glucose as an energy source.
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