How To Avoid Keto Flu – Root Causes & How To Combat It

The ketogenic diet has been gaining popularity for its potential health benefits. But, like any major dietary change, it can come with some uncomfortable side effects. What many people don't know is that one of the most common side effects of starting a keto diet is something called “keto flu”.

Wondering how to avoid keto flu?

In this comprehensive guide, we'll discuss what the keto flu is, how it affects the body, the importance of electrolytes, and practical tips for managing these symptoms and maintaining optimal electrolyte balance.

What is the ketogenic diet?

The ketogenic diet is a low-carb, high-fat, and moderate-protein eating plan designed to shift your body's primary energy source from carbohydrates to fats. This change in fuel leads your body into a metabolic state called ketosis, where it burns fat for energy instead of glucose derived from carbohydrates.

The benefits of the keto diet can include weight loss, improved mental clarity, increased energy, and reduced inflammation. However, as your body adapts to ketosis, you may experience some temporary side effects known as the keto flu.

What is the keto flu?

The keto flu refers to a group of flu-like symptoms that some individuals experience during their initial transition into ketosis. This can occur when the body is adapting to its new primary energy source – fat, instead of carbohydrates. Symptoms of the keto flu may include:

  • Fatigue
  • Headaches
  • Nausea
  • Brain fog
  • Diarrhea
  • Dizziness
  • Irritability
  • Muscle cramps or spasms, muscle weakness

These symptoms typically last for a few days to a week and can be managed by ensuring proper electrolyte balance and hydration.

What causes the keto flu?

There are a few different factors that play into the keto flu and whether or not you'll experience it. Electrolyte imbalance is the main cause.

The role of electrolytes in a keto diet

Electrolytes are minerals that help regulate various bodily functions, such as muscle contractions, nerve function, and fluid balance. The primary electrolytes to focus on during a keto diet are sodium, potassium, and magnesium.


Sodium is crucial for maintaining fluid balance, nerve function, and muscle contractions. The recommended daily intake of sodium for adults is between 1,500 to 2,300 mg per day. On a keto diet, you may need to increase your sodium intake to account for increased excretion.


Potassium is essential for heart function, muscle contractions, and maintaining healthy blood pressure. The recommended daily intake of potassium for adults is between 2,500 to 3,000 mg per day.


Magnesium is involved in numerous processes, including energy production, nerve function, and muscle relaxation. The recommended daily intake of magnesium for adults is between 310 to 420 mg per day.

When following a ketogenic diet, the body must adjust to using ketones as fuel instead of glucose. During this process of adaptation, dehydration can occur due to increased urination caused by reduced insulin levels in the blood.

This can lead to an imbalance of electrolytes in the body, causing the symptoms stated above.

Other causes of the keto flu are:


As your body transitions to ketosis, insulin levels decrease, leading your kidneys to excrete more sodium and water. This increased water loss can result in dehydration, which may contribute to some keto flu symptoms.

Sugar withdrawal

Reducing carbohydrate intake on a ketogenic diet means cutting back on sugar. For some individuals, this sudden decrease in sugar consumption can cause withdrawal-like symptoms, similar to those experienced during caffeine withdrawal.

Poor diet

A poor diet is often the root cause of keto flu symptoms. Consuming highly processed foods, not getting enough essential nutrients, and failing to maintain proper electrolyte balance can all contribute to the onset of keto flu. By making suitable dietary adjustments, you can avoid these symptoms and have a smoother transition into ketosis.

Body's adjustment to a new fuel source

Switching from glucose to fat as the primary fuel source can cause an initial energy dip as your body adapts to burning ketones for energy. This adjustment period can lead to feelings of fatigue and lethargy, often associated with the keto flu.

How to avoid keto flu

To manage electrolyte imbalances while starting a ketogenic diet and avoid keto flu altogether, consider the following tips.

Consume nutrient-dense foods

Ensure your meals consist of whole, nutrient-dense foods like leafy greens, lean proteins, healthy fats, and low-carb vegetables. Avoid highly processed foods, even those labeled as "keto-friendly."

Maintain electrolyte balance

Electrolytes such as sodium, potassium, and magnesium play crucial roles in maintaining proper hydration and muscle function. Incorporate foods rich in these minerals, like avocados, nuts, seeds, and leafy greens and vegetables, into your diet.

Stay hydrated

Drink plenty of water throughout the day to help maintain proper hydration and electrolyte balance. Aim for at least 8 cups (64 ounces) per day.

Gradually transition into keto

Instead of diving headfirst into an extremely low-carb diet, consider gradually reducing your carbohydrate intake over a few weeks. This can help your body adjust more smoothly to the new fuel source.

Consider supplements

If you're struggling to get enough electrolytes through your diet, consider taking supplements to help maintain optimal levels.

Tips for staying hydrated and managing keto flu symptoms

Proper hydration is essential for managing keto flu symptoms and maintaining electrolyte balance. Here are some practical tips to stay hydrated:

  • Drink water regularly, aiming for at least 8 cups (64 ounces) per day
  • Consume bone broth, which provides both hydration and electrolytes
  • Limit diuretics, such as caffeine and alcohol, which can increase fluid loss
  • Monitor your urine color – pale yellow indicates proper hydration, while dark yellow or amber suggests you may need to drink more water

Achieving long-term success on a ketogenic diet

To ensure long-term success on a keto diet, keep these pointers in mind:

  • Monitor your body: Pay attention to how your body feels and reacts to the keto diet. Track your food intake, energy levels, and any symptoms you may experience.
  • Adjust as needed: Consult with a healthcare professional if you're experiencing persistent or severe symptoms. They can help you make necessary adjustments to your diet, hydration, or electrolyte supplementation.
  • Be patient: Remember that the keto flu is temporary, and your body will adapt to its new fuel source over time. Give yourself grace during this transition period.

By understanding the common symptoms of the keto flu, managing electrolyte imbalances, and staying committed to your health goals, you'll be well-equipped to conquer the keto flu and thrive on your ketogenic journey. 

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About the author 

Mallory Milne

Mallory is a 38-year-old mom of two and the founder of HGHH. After battling through challenging complications from Essure, a permanent form of birth control that has since been pulled from the market, Mallory underwent a hysterectomy in 2020 and experienced difficulty losing weight. Understanding the roadblocks women face when trying to achieve their fitness goals after a hysterectomy, she created HFHH to provide support, tips and guidance for other women on their journey to weight loss and better health.

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