The Keto Flu: Understanding the Symptoms and How to Overcome Them


The ketogenic diet, or simply the “keto” diet, is a high-fat, low-carb diet that has gained popularity in recent years for its ability to help people lose weight and improve their overall health. However, many people who start this diet experience a phenomenon known as the “keto flu.” In this article, we’ll explore what the keto flu is, why it happens, and what you can do to overcome it.

What is the Keto Flu?

The keto flu is a collection of symptoms that some people experience when transitioning from a high-carb, low-fat diet to a low-carb, high-fat diet. The symptoms usually appear within the first few days of starting the diet and can last anywhere from a few days to a few weeks. Common symptoms of the keto flu include:

  • Fatigue
  • Brain fog
  • Headaches
  • Muscle aches
  • Nausea
  • Insomnia
  • Constipation
  • Irritability

Why Does the Keto Flu Happen?

The keto flu occurs because the body is transitioning from burning glucose (sugar) for energy to burning ketones (fat) for energy. This transition can take some time and can be accompanied by some unpleasant symptoms.

When you consume a high-carb diet, your body can easily convert glucose into energy. However, when you switch to a low-carb diet, your body has to start producing ketones to use as energy. This shift can be difficult for some people, as their body is used to using glucose for energy and are not yet used to using ketones.

Additionally, the body may also experience a loss of electrolytes (such as sodium, potassium, and magnesium) due to the reduction in carb intake. This can contribute to the symptoms of the keto flu.

How to Overcome the Keto Flu

While the keto flu can be unpleasant, there are some things you can do to help overcome the symptoms. Here are a few tips:

  1. Stay Hydrated: Make sure to drink plenty of water and electrolyte-rich beverages such as bone broth, coconut water, or sports drinks. This will help replenish any lost electrolytes and reduce the symptoms of the keto flu.
  2. Increase Your Salt Intake: Sodium is an important electrolyte that is often lost when transitioning to a low-carb diet. Increasing your salt intake can help reduce symptoms of the keto flu.
  3. Get Enough Sleep: Making sure you get enough sleep can help reduce fatigue and improve your overall energy levels. Aim for 7-9 hours of sleep per night.
  4. Add More Fat to Your Diet: Increasing your fat intake can help provide your body with the energy it needs to transition from using glucose to using ketones. Consider adding healthy fats such as coconut oil, avocado, nuts, and seeds to your diet.
  5. Gradually Reduce Your Carb Intake: If you are transitioning to a ketogenic diet, it may be helpful to gradually reduce your carb intake over several weeks rather than making a sudden change. This can help your body adjust to the new diet more easily and reduce the severity of the keto flu.
  6. Consider Supplements: Taking supplements such as magnesium, potassium, and sodium can help replenish any lost electrolytes and reduce the symptoms of the keto flu.


The keto flu is a common experience for many people who transition to a ketogenic diet. While the symptoms can be unpleasant, they are usually temporary and can be reduced or overcome with a few simple steps. Drinking plenty of water, increasing salt and healthy fat intake, getting enough sleep, gradually reducing carb intake, and considering taking electrolyte supplements can all help reduce the symptoms of the keto flu.

It’s also important to remember that everyone is different, and not everyone will experience the keto flu. If you do experience symptoms, it’s important to be patient and give your body time to adjust to the new diet. With time and proper care, the symptoms will usually subside, and you’ll be able to reap the many benefits of the ketogenic diet.

In conclusion, the keto flu is a normal and temporary experience for many people who transition to a ketogenic diet. By understanding the symptoms and how to overcome them, you can make the transition easier and enjoy all the health benefits that the ketogenic diet has to offer. If you have any concerns or questions about the keto flu or the ketogenic diet, it’s always best to consult with a healthcare professional for personalized advice and guidance.

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