Fasting and brain fog

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  • posted by Jeremy Fisher
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    I’ve just started fasting 3 days a week, with no food between 6pm one day to 6pm the next. I find the afternoon really difficult and get what I’ve heard to referred to as ‘brain fog.’ I’m just not ‘on it’ and find it hard to concentrate, particularly on anything complex.

    I’ve had this before when doing the fast800 diet, and it lasted about a week, when my body adapted to using fat rather than carbs, but when intermittent fasting, I’m wondering if my body will adapt in the same way or this is just what’s to come every afternoon when I fast!

    I’d love to hear from anyone who has had experience with this.

  • posted by WindyJulz
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    Hi JF – are you taking any electrolytes or salt during your fast? That would be my first point of call, assuming you are drinking enough water.
    Are you having coffee during your fast? If you normally have coffee and suddenly cut it out you may also be feeling a bit of caffeine withdrawal. Black coffee / tea is ok to have on a fast.
    a mug of stock / broth is another option to help you get through the foggy parts of the day.

    I have done up various 24hr; 36hr, 48hr fasts and one 72hr fast. I did find alternate day fasting (not eating mondys, wednesdays and fridays) more difficult than a weekly longer fast. I think 20-24hr is the hardest point and repeating that part 3 times a week was not a lot of fun. I prefer fasting Thursday lunchtime to Saturday lunchtime for example.

    Worth playing around with it to find what suits you. But salts and electrolytes will help. Your body needs them and normally gets sufficient quantities from food….so if your not eating you will need to add some in.

  • posted by Jeremy Fisher
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    Thanks – I’ll try electrolytes and see if that helps.
    I had a much better day yesterday (my 5th fast day) so hopefully, that’s a good sign that my body is getting used to things.

  • posted by Jeremy Fisher
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    Three weeks in and the brain fog is much improved. I still get it, and am best avoiding complex work tasks on fasting afternoons, but it is much better!

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