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24hr Fasting Headache

Has anyone experienced headaches while doing a 24 hour fast? Recently I’ve tried this but get to late morning before it starts to come on. Drinking plenty of water so doubt it is dehydration; could it be caffeine withdrawal ?

Answer

Electrolytes. Bunch of water is good, but depletes electrolytes which can(will) cause headaches. Keep up the water, but keep up electrolyte intake, as well.

If you are quitting a caffeine habit, that could cause headaches as well. Just depends on how, well, dependent on it you are.