During the first few days of the ketogenic diet, some people may experience flu-like symptoms, which often make people think that ketosis is not suitable for our bodies. These symptoms include headaches, lethargy, mental confusion, irritability, and generally feeling "off." This is commonly known as the keto flu, carb flu, or induction flu. The keto flu has a few causes which include
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Adjustment to ketosis. While our bodies are designed to be able to transition from ketosis to glycolysis, it's not always an easy transition.
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Carbohydrate withdrawal. There are studies that show that sugar acts like a drug. Drastically reducing carbohydrate (sugar) intake can cause flu/withdrawal symptoms. Either you hold out until the cravings subside or you reduce your carbohydrate intake slowly.
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Finally, the most common cause of the flu: electrolyte deficiency. Most people lose weight quickly when they enter ketosis. Along with that water, you are flushing electrolytes out of your body. Combined with the fact that those following a ketogenic diet require more sodium, it means it's very easy to not get enough and get the flu. No you assume that simply adding more salt to your food will be enough.
Keep in mind that symptoms of the "keto flu" can occur at any time while on a ketogenic diet. The flu can almost always be avoided if you stay well hydrated and properly replenish your electrolytes.
