The experience of feeling very poor when beginning the ketogenic way of eating. The Keto Flu does not happen to everyone. There may be ways to prevent it and heal it.
While in ketosis, the body is producing ketones. These small molecules are used as fuel when we have depleted our glucose (a.k.a. blood sugar) supply. Ketones are produced in the liver from fat, as we eat very few carbs and a moderate amount of protein.
The entire body – including the brain – consumes ketones as fuel.
One who’s way of eating is the ketogenic diet.
Ketosis, or “keto”, is a natural state for the body in which it becomes almost completely fueled by fat through eating a ketogenic diet: low carb, moderate protein, and lots of healthy fats. As babies, we are all born in a state of ketosis and remain that way until we begin eating solid foods (breast milk is almost entirely fat!) We also dip into a state of ketosis when we enter prolonged periods of not eating, or fasting, including while we are asleep. It is highly likely that you wake up in a ketogenic state!