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Any idea why i feel agitated/heart beating fast when fasting more than 40 hours?

I wish I could fast longer, but even in this 3 day fast I’m trying to do, 2 days in and i feel very agitated, my heart is beating faster and i can’t sleep well.

Any idea what to do about it?

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Answer

My heart rate is higher than normal, too. It’s normally around 60 bpm but during this fast I’ve been around 80 bpm at rest.

Might be cortisol and adrenaline. Might be overly casual electrolyte supplementation.

I’ve started a back-to-back 96h-24h fast-feed regime. Third day of the second round. Goal is to get into normal range BMI from obese range.

Answer

Its because of the orexin your body is producing due to ketosis (its shown that keto/low carb diet produces more orexin) and its making you more alert so even on the slightest tought your hearth might be more active and responsive

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Categories: heart 3 day fast sleep cortisol obese ketosis keto low carb