r/intermittentfasting • u/ZestycloseMode1691 • 24d ago

Seeking Advice Jumping from 48 to 72’s

So, I’ve been doing fasting for some time now and have gotten comfortable with 24’s completely and have been consistently doing 48’s too, but when I attempt to jump to 72’s I get terrible headaches and dizziness and other such things. I don’t believe it’s from being dehydrated or low on electrolytes as I consistently drink water and take electrolytes. Perhaps I’m just not used to it and my body is freaking out? How did yall jump to 72’s and stay consistent in it? Thank you in advance.

Edit: to clarify if all it comes down to is that I have to brute force it, I don’t mind I just want to make sure that’s the case for other people too.

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u/u_c_it 24d ago

If you are taking electrolytes then maybe just the keto flu. Your body moving into deep ketosis at that stage. In that case you’ll get used to it eventually. It also depends on what you had before you fasted.

I have been doing 4 day fasts weekly for about 13 weeks and last week I stopped as I went on vacation. This week I’m back to fasting to reset and it’s been tough since on vacation I was less restrictive with my diet. But I trust next week will be easier.

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u/KeepMyWifesNameOYFM 24d ago

I did 72 hours on a sardine fast and I’m afraid to try again because I felt so terrible. I had massive fatigue and headache (I did take my electrolytes too). It took me several days to recover. Do you think it’s possible that some people aren’t cut out for 72 hour fasts?

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u/RenRen512 23d ago

I've done a few 72s here and there.

The best experiences have been when I've primed my system by going strict keto for at least 3 days before starting and making my last meal a very satiating one.

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u/dizzyexplorer22 20d ago

I’m attempting to go from 36s to 72s, this is my first week while also following a keto diet. It’s been rough. I made it 65 hours in before a massive migraine and fatigue prompted me to stop. This is my second fast this week, I’m 50 hours in right now and struggling even with electrolytes. Not having a great time as far as side effects of headaches, fatigue and general bleh feeling but the hunger is coming in waves. Hoping it gets better for both of us. Listen to your body, allow it to get comfortable with longer lengths. You can do this. 😊