I've heard a lot about this, never put much thought into it. Did Atkins before with no issues what so ever.
This time around - wow yesterday I was like this:
Headache, dizzy, and literally falling asleep at my computer!
But yesterday, I only had 15.6 carbs and 944 calories. Not good I know. Plus I was reading online about the salt and trying to drink chicken broth. So to get me out of the funk I ate some deli ham and 1 oz cheddar cheese and drank a cup of broth.
I'm feeling a lot better, still massive headache and a bit dizzy, but don't feel so tired.
Going forward I will not, let my carbs go that low again - I did the same thing on Sunday, ended up out and bout when I had planned to be - stopped at Bojangles and got some Buffalo Bites - non breaded chicken in a spicy sauce, 4 carbs. And had 14.9 carbs and 1009 calories.
I had not planned either of these days to be that low on carbs, but work and other commitments pulled me away and didn't get to grab something like I had planned.
So lesson learned for me, I need to prep snacks and things to eat a lot more so it's there at a moments notice. I did cut up a ton of broccoli last night so I can have as a quick snack today.