Welcome to The Fast Diet › The official Fast forums › Body › Science of intermittent fasting › Stages the body goes through when we fast
This topic contains 3 replies, has 3 voices, and was last updated by Superlambanana 4 months, 1 week ago.
Viewing 5 posts - 1 through 5 (of 5 total)
8 Sep 20
I’m sure theres an answer to this somewhere already, but can anyone remind me of the stages the body goes through as we fast? Something like: Liver uses up glycogin, then ketosis, then fat burning? How long does each stage take? Is there any recent thinking on this?
Ive been fasting all my life in some way. As a child I was never interested in breakfast and then as a young adult, when I had more control over what I could eat/ not eat i would often have just one meal a day. The rise of 5:2 gave me confidence that I wouldn’t in fact drop dead if I only ate when I was hungry. So from 2013 I had at least one day a week without food, although I’ve never been very disciplined about what liquids I have, so I have coffee with milk and sugar, diluting orange, even the odd can of diet coke.
I stopped regularly fasting a couple of years ago after a bereavement and have put on weight during the pandemic, so yesterday I didn’t eat anything for the first day in at least a year. It went ok and seemed easy enough.
This morning i woke up and felt a bit weak, shaky, sweating a bit. Low blood sugar?
Seems odd that I am a stone heavier than usual (so should have plenty of reserves!), and yet when i fasted before I wouldn’t feel any different the next morning- I’ve only previously experienced this feeling after a long fast (3/4 days) and assumed it was ‘true hunger’ so ate something.
I ate a banana earlier so feel fine now. But I’d like to read up on some of the latest science. Years ago when i last tried to read about it there was a lot of guff online, but fasting has been pretty mainstream since 2013 now.
There must be some recent articles/ books which explain how and why our body reacts? I’ve always had a notion that the gallbladder gets a bit confused when we eat after a fast. Also, has anyone done any more research on the mental health benefits and any long term negative side effects?
Thanks in advance all!
9 Sep 20
It really depends on many factors: How much stored glycogen your body has, how much exercise you’re doing, how many calories you’re consuming on your fast day, how much carbohydrates and sugars you’re eating on non fast days, etc. It can take a up to 3 or 4 days to move into ketosis.
12 Sep 20
Here is a good starting point: https://lifeapps.io/fasting/the-5-stages-of-intermittent-fasting/#:~:text=The%205%20Stages%20of%20Intermittent%20Fasting%20with%20the%20LIFE%20Fasting,is%20in%20%E2%80%9Cgrowth%E2%80%9D%20mode.
14 Sep 20
Thanks folks. I fasted again last week on Wednesday and woke up on Thursday feeling perfectly fine. So the Tuesday morning weakness might just have been a blip. I ate normally over the weekend and will fast again today so lets see how I feel in the morning. Could be the booze etc at the weekend having an impact of course!
Thanks @dykask for the link. That was just what i was looking for. I’ve downloaded their app – is anyone else using it?
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