Any ideas what might cause headaches after fasting? I get them quite a bit despite drinking lots of water and taking electrolytes. Today I did a 20hr fast and then got really bad headache afterwards. I did do a run too and tried to keep low heart rate which is normally fine for me, but maybe my HR was raised a few times then may have overdone it? But I get headaches when I do fasts w/out exercise too. So maybe it is a side effect from weening off refined sugar/processed foods? (I’m only 2 weeks into starting IF + ‘clean eating’ again after about 6mths off). Hopefully the headaches go away soon! Thanks all :)
I got headaches really bad during weeks 2-3 starting fasting. I still get them here and there but I’m on week 7 and they’ve subsided dramatically. Probably just my body adjusting to fasting and the change to my caffeine/sugar intake.