[Arrekin]

Your body is switching to ketosis. You can read about it a lot and it's literally called keto-flu by the keto diet community :) If you want to ease the transition, you should first get into ketosis, but not fasting yet(so still eating but not carbs), and after ket-flu is gone then try fasting. From my experience all that comes from shock to the body. You are simply not used to it. It gets better over repeated attempts. Also for the headache - do you still drink caffeine? Brutal headaches usually come from caffeine withdrawal(if you normally drink it but stop during fasting). If that is the case you need first to drop caffeine slowly lowering your daily dosage so the headaches won't happen.

[riehwvfbk]

This kind of has me wondering if this is actually good for the body. Ketosis is not without downsides. Alcohol actually acts much the same way in someone completely not used to it. Interesting to hear that it's not just me, and the people who do this all the time also suffer.

So the idea is to ignore the body's defense mechanism in order to... what? Lose weight? Feel good about having suffered through this? I guess I'm trying to figure out the upside. Like lowered social inhibition with alcohol :)