Well, as the title implies I’m new sort of. I had tried the 5-2 last year but real life beat me and I started eating as per usual..

I’m aware this question may have been asked many times before, but I wondered if any facts may have changed in the past year or two.
My question is now that I’m re-starting the 5-2, is it OK to do water only days?

I’m intending to do a Monday and a Thursday diet day with zero calories. Reason being I find it very hard to stop snacking if I have even a small bit of food in the beginning of the day. It’s a kind of all or nothing approach.

Does this method work for you? Is it sustainable?

I remember one thing of doing this before, was that I got terrible headaches during the diet days that water couldn’t dissipate. Not always but they were a pain in the head!

Ketones, carb withdrawals etc, I never did work out what those headaches were.

Any advice and help much appreciated.

Ah I see. Sodium. I’ll need to read up some more but thanks for the advice.