Ketosis is a state in which, when your body is low on glucose, it burns stored fat to produce ketones that can act as an alternative source of energy for the brain.
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It is reflected by a raised level of beta-hydroxybutyrate, the main ketone body circulating in your blood. Ketosis may occur when you’re following a very low-carbohydrate diet. You may also have light ketosis during intermittent fasting or overnight fasting.
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If you are healthy, ketosis is neither good nor bad for your health. It’s just the body's way to adapt to an abnormal situation. However, for certain people (like those with type 1 diabetes), very high ketone levels indicate diabetic ketoacidosis, which is a severe condition caused by a lack of insulin.
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