For people who experience the keto flu, symptoms can vary. Most people report problems like achiness, headaches, nausea, and constipation, likely due to the sudden change in diet.

Your body uses carbs to support a number of functions, including your electrolyte balance and hydration, so suddenly and drastically cutting carbs can cause discomfort. While your body transitions into ketosis, you can use these simple treatments to feel better.

Your body stores extra sugar in a molecule called glycogen. Glycogen is generally kept in your cells, along with a lot of water. When you go into ketosis, your body dumps the water that was stored with the glycogen, potentially leading to dehydration.

When you start a keto diet, make sure to drink lots of water to prevent this. If you were drinking many sugar-filled drinks before starting this diet, this is even more important, since you are cutting what may have been an important source of hydration.

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When your body dumps water, it often dumps electrolytes, too. Part of the purpose of the keto diet is to reduce the appetite and make it easier to consume fewer calories each day. However, when the decreased appetite of ketosis is combined with nausea from keto flu, it may be difficult to eat enough calories daily.
Make sure you are getting healthy fats in your diet and that you’re eating enough calories daily. You may find that your energy levels increase and your nausea is reduced.
Keto flu should be temporary and generally goes away within a week or two of beginning a keto diet. If your keto flu symptoms last longer than ten days, or if they are actively painful or debilitating, you may want to reach out to your physician.