I know there was a somewhat similar question a while ago but that involved a much longer period of fasting. So here goes...
I've been Paleo for sometime now and wanted to get the benefits of IF. I basically began with the missing breakfast scenario which basically went fine. (Might not seem like much of a big deal but I've been an ardent breakfast eater all my life so it is a big change.)
I've been missing breakfast most days and not eating till around noon or having bulletproof coffee when I want an extra rush to cycle to work and keep me going.
But every time I try a longer fast i.e 24 hours, I get a terrible headache around 4pm the next day which doesn't go away till the next morning. I generally break it when the headache kicks in. Hunger is very mild so I could easily do a few more hours if it wasn't for the headache.
So the question is; Do I accept that is my breaking point and make sure I break my fast before the 4pm mark or is there something wrong with my blood sugar? This is only the second time I have attempted to do a whole day fast so maybe it gets easier with time?