Chiron,
If this quote were to be true................
"However, if you also get a sense of dramatic weakness, tiredness, mental clarity, or the smell of fingernail polish remover, stop the fast...those are signs of a serious condition".........................
then no-one would fast.
However, if one experiences "extreme and prolonged weakness", then this can be a danger signal for the fast to be ended, but is extremely rare.
I would like to know where they got this information, as it is misleading and inaccurate.