WIY-
You are obviously not so well informed. If you knew how sick I frequently get on fast days you would not make such a statement…
“such sissies”.
I get severe headaches for which I swallow vicodin w/o water. I get nauseous, weak and stomach pain. One year I had to get into bed after Mussaf and could not go back for Mincha or Ne’eilah. I was biting on my blanket to try and relieve the pressure in my head.
Any rational person would say that if there is something that can make my fast easier, I should take it.
Btw, I only fast on YK for this reason, as even by Tisha B’Av the Mishna Brura says that one who is a choleh (as I described above) “ein ke’dai le’hachmir”.