*an example of not feeling well , weird leg cramps at night, running along the front of my shin, and ongoing interrupted sleep. Also more hungry in the middle of the night.
Have you been taking the additional liquids and broth that is advised by all the LC and ketogenic experts? And a well formulated LC diet will reduce hunger and increase satiety.
Certainly I never seen any link that connects PIR and cramps, and the cramps are a common and well known 'side effect' of cutting carbs without making the required adjustments to salt, magnesium and potassium that is advised in all the literature - especially with exercise.
I highly recommend the book The Art and Science of Low Carb Living by Voleck and Phinney. It is a fantastic explanation of low carbing, including a debunking of all the myths, and beautifully clear explanations of the pitfalls (and how to avoid them). It comes from over 20 years of research into LC including studies on dieters, LC endurance athletes and everyone in between.
There is a downside to LC becoming more and more popular, and that is many people are now leaping into it without doing adequate background reading, and going by word of mouth on forums like this. I never think that is a wise thing. We should all do proper reading and allow for our own individual physical requirements, which is why I am contantly popping up in threads suggesting info sources and background reading.
I find that LC is a fantastic way of eating, and find it deeply regrettable when people blame low carbing for issues which would not happen with well formulated LC diets (of course, that is true of ANY way of eating!

This thread is a prime example.
The OP posted a query, that resulted from a rapid switch to severe LC over a short time, followed by fairly severe fasting.
I posted a comment and suggested background reading.
The OP found it useful, ate a few more carbs and their issue was totally resolved.
I would hate for people to start claiming that PIR is harmful, when there simply are not (yet) any sources to establish this either way.
Having said that, I am against extremism in any form, and think that rushing into very low carbing is a shock to anyone if they have recently been eating moderate carbs or more. This is a long game. There is absolutely nothing wrong with being gentle with ourselves and making adjustments to suit our own bodies.
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