Keto Flu

The Keto Flu

When your body first switches from being a sugar burner (glucose) to a fat burner, the keto flu can occur. Your body then targets the fatty acids, which are then burnt in order to produce energy instead. When your body is able to burn fat in order to produce energy, instead of carbs, this is when you enter into a metabolic state known as ketosis.


When you switch from the Standard American Diet (SAD), which is usually a lot of processed foods that are high in added sugars and salts. Your salt intake is drastically lower, and the lack of carbs also lowers insulin levels. All of this leads to your kidneys to release excess water. With the excess water released, your electrolytes are also flushed out. You may start to have the following symptoms:


  • Headaches
  • Cramps and sore muscles
  • Stomach pain and constipation
  • Insomnia
  • Nausea
  • Brain fog and difficulty focusing
  • Heart palpitations
  • Fatigue
  • Bad breath
  • Dizziness
  • Mood swings, irritability and cravings


I had most of these and Gary had noneā€¦go figure. This can last anywhere from a few days to a month for some people. It was about a week on and off for me. As soon as I started to feel a headache come on I would make a shot of sea salt, lemon, and water, which would usually do the trick.

What to do to avoid or help with the keto flu:

  • Stay hydrated
  • Replenish electrolytes (magnesium, sodium, potassium)
  • Get plenty of sleep
  • Do light exercise


I tried a few supplements when I first started but quickly gave up on that. I really dislike taking pills. The only things I took constantly throughout the process were magnesium and sodium. I would eat an avocado for potassium. I also added krill or fish oil to my daily routine.

the keto flu videos

FAQs 16 with Dr. Westman: Keto Flu and Other Side Effects

What is the deal with the keto flu? - Ketovangelist

How Long Does Keto - Adaptation Take to Occur?


We are not medical professionals. The information on our site, online or through email should NOT be considered medical advice or treatment. Always consult with your primary care physician.