The keto flu happens commonly to keto dieters due to low levels of sodium and electrolytes and has flu-like symptoms including:
It's important to note that this isn't the real flu! It's called keto flu due to similar symptoms but it is not at all contagious and doesn't actually involve a virus.
The main cause for keto flu is your body lacking electrolytes, especially sodium. When starting keto, you cut out lots of processed foods and eat more whole, natural foods. Although this is great, it causes a sudden drop in sodium intake.
In addition, reducing carbs reduces insulin levels, which reduces sodium stored by kidneys[25].
Between your reduced sodium intake and stored sodium flushed by your kidneys, you end up being low on sodium and other electrolytes.
The best way to avoid (or end) the keto flu is to add more sodium and electrolytes to your diet. Here are the most effective (and tasty) ways to get more sodium:
Try to eat more sodium as you start keto to prevent the keto flu entirely. If you do catch it, just remember that it'll go away quickly and you'll emerge a fatburning machine!
For more information about the keto flu, visit our Keto Flu Guide.
The keto flu can be avoided by consuming enough electrolytes, especially sodium.