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just for the sake of warning, keto shows lots of results, but taps into a body mechanism that yields some form of withdrawal syndrom (keto flu IIRC)

Ketosis is the medical condition. It occurs when your body metabolizes fat for energy instead of glucose.

.. which initially lasts days to a few weeks but the length can be shortened by fasting or supplementing with MCT oil or beta hydroxy buterate

And taking some extra salt and water per day. 2 cups of broth does it for me. No more keto flu.

Note that keto flu only occurs when your body is switching from carbs to fat, but disappears when your body is keto-adapted.