I have been feeling a bit dizzy on standing - long term low BP- and went for a check up at my GPs. Saw a nurse.
We discussed weight etc.
"ooh you've lost a lot of weight -13kg - since 2006."
I mentioned I had lost even more but put it back on, and was low carbing.
"oooh I hope you're not overdoing it"
I said I was pre-diabetic and was cutting out as many carbs as possible
"oooh make sure you eat enough, you need them for brain power"
I thought that I'd better not push it any further!
Then she said "now are you drinking enough water?"
oh, yes, a fair amount really
"that's what it'll be, this dizziness, you not drinking enough water. That'll be the answer, stand up carefully and drink more water"
(!)