Ketosis is a natural metabolic state. It involves the body, via the liver, producing ketone bodies from fat and using them for energy instead of glucose derived from carbohydrates. You can get into ketosis by starving the body of glucose. This is most conveniently done by following a very low carb, high fat ketogenic diet.
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A keto diet, aka a ketogenic diet, is a diet which enables the body to: transition from burning carbohydrates to using fat as fuel and maintain the use of fat for fuel instead of carbohydrates The body produces two substances when carbohydrate intake is high: Glucose: Glucose is the easiest molecule for the body to convert