[mateo1]

People talk about these "wondrous" effects of fasting. All I got was headaches, tiredness, feeling sick and constantly thinking about food. I lasted 5-6 days, tried to keep my electrolyte intake as well as I could, and it was miserable. I managed to eat very little (like 500-600kcal) on day 6 and really gorged myself on day 7 despite knowing about refeeding syndrome, I just couldn't help it. That was during my prime as well, I woudn't try it again now. Maybe it does indeed work for some people due to metabolism disorders or something, but it really didn't for me. And for god's sake don't do 10-15-20 day fasts without medical supervision.

[rhinoceraptor]

It gets easier as your body gets used to it, and you shouldn't start with a 7 day fast without experience doing 24 and 48 hour fasts.

The first time I tried a 7 day fast it was like you described, I made it to about day 5 and I couldn't take it anymore. I've done about six or seven 7+ days fasts and now it's not a big deal, I feel totally fine the whole time. If I haven't kept up on electrolytes, I might get a little light headed when I stand up, but that's about it.

I use an electrolyte mix that has sodium, potassium, magnesium, calcium, phosphorus and iron. It's a bit hard to find mixes that have phosphorus, and that's the main electrolyte that is depleted in refeeding syndrome.

[abdusco]

> ... All I got was headaches, tiredness, feeling sick and constantly thinking about food. I lasted 5-6 days, tried to keep my electrolyte intake as well as I could, and it was miserable....

Fasting is not just about not eating for 16 hours in a day. When you break fast, you need to watch how much you eat, and eat a lot less.

If you fast for 16 hours then gorge yourself, your stomach will keep growling and you won't be able to get used to being hungry and think about something else.

After a couple days of moderated eating + fasting your hormone levels will reach equilibrium and you won't feel hunger as intense / won't mind it at all.

[mateo1]

I think there's a misunderstanding about the semiotics of fasting. I don't mean intermittent fasting, I mean not eating, at all.

[abdusco]

It doesn't really matter. Substitute 16 hours with however long you're fasting. You need to keep your eating habits in check when you break fast.

I'm a muslim who fasts during Ramadan (no eating / drinking until sunset) for a month, and either because I'm just conditioned mentally or because my body adapts itself, I don't really mind being hungry after 2-3 days. And the less & lighter I eat, the easier it is.

[mateo1]

>It doesn't really matter.

Yes it absolutely does. You can do intermitted fasting for 10 years but most people will die when they continuously fast for more than 20 days unassisted by IV nutrients. Are we really on the same page here?

Your religious experience of skipping lunch and having a late dinner used to be my daily routine during uni, aside from a couple of coffees with a cig. Fasting for 12-16 hours is very different from fasting for 120-160 hours. Whatever you may think, you cannot be mentally conditioned not to eat at all. I'm having trouble believing that people extrapolate their experience of skipping a meal to not eating anything for days or weeks in a row.

[loceng]

Re: 'People talk about these "wondrous" effects of fasting. All I got was headaches, tiredness, feeling sick and constantly thinking about food.'

It sounds like you went into it without understanding the processes that will be unfolding - you didn't do enough research, otherwise you'd understand the symptoms you described.

The first time you fast will always be the roughest - most challenging too, especially since you've likely been eating highly inflammatory foods your whole life, likely without any break - and so by removing those foods and that inflammation from your body and brain, your brain is going to start functioning differently - and better.

Your brain 1) has to prune the pathways that were dependant on such a high level of sugar in your system (and not running off of ketones), and 2) inflammation has a depressant effect on the nervous system - and so you're essentially self-medicating to depress yourself when eating inflammatory food - and when you remove that, that depression is going to life, so your brain is going to want to start working faster as well - and so there will be pathways that will want to open up again that are no longer being suppressed-depressed.

It's also possible you weren't drinking enough water - or something was off with the electrolytes amount; you don't need any electrolytes or supplements if doing 3 days or less.

Refeeding syndrome is also a myth or rather it's a concept that formed from misunderstanding and poor guidance: "you have to eat small amounts and reintroduce foods slowly so you don't cause X, Y, Z." Bullshit. If you're eating food that's harming you, that you're sensitive to and your body is sending you pain signals for - but then you ignore that discomfort and continue to eat it, eventually you'll get somewhat "conditioned" to it - so you won't feel it as much - but that pain/discomfort/disruption/signal will still be there.

When I break a fast - I've done many 3 days, a dozen or so 5 days, and a couple ~10 day fasts - I literally cook one or two massive high quality and high fat steaks and devour one immediately - and the second usually within 2 hours. I don't feel any discomfort after, and I can feel my body being happy, and my mood lifts as my body knows it has food again; sometimes I'll have kale and a pack or two of raspberries - but I usually only add that on the following day. Simple, non-processed foods that I know my body is fine with - and the steak and kale being highly nutrient and energy dense (for their food group).

I break my fast with, return to food I know my body is good with because I've done the work to figure out (and not only through an elimination diet but also diagnostics that's far more efficient and provides concrete results to follow) - rather than in an unaware-unexplored fashion ingesting whatever I've been relatively unconsciously been eating for most of my life.

It was only in my early 20s a doctor told me to stop eating wheat due to symptoms he saw I had. No one prior to that ever suggested food could have been a source of any of my problems. Soon after that I realized I was allergic to eggs, learning later it is specifically egg whites - to which my mother also later learned she is also allergic to.

The mind is a powerful thing and will allow us to do things that are harmful to us, even pulling us away from, disconnecting us from feeling, suppressing us from feeling this harm that we're doing to our body - whether from food or physical activity. Most people don't do the work to explore, in part because no one has explained it to them thoroughly enough for them to be motivated enough to try.

I'd urge to you to try fasting again - but also to be gentle with yourself, don't be forceful or violent with yourself. Just start doing 3 days at a time to start. Likewise, figure out what a healthy-clean diet is for you - nd do that diet for at least 3-5 days before starting your water fast so then you have good energy and nutrient reserves at the beginning of the fast. And then break your fast with that same diet. If you need help figuring out how to figure that out, let me know, and I'll do my best to help. I plan to eventually write a book on the topic, at least a chapter of it, but I don't have anything complete to share with you yet in this regard.

I'd also recommend you read this other comment I just made - which will help you better understand processes that occur during fasting: https://news.ycombinator.com/item?id=31409602

And here's a 30 minute video by Dr. Jason Fung explaining by water fasting is good, healthy, and safe for us (arguably unless you're underweight and don't have fat reserves to burn): https://www.youtube.com/watch?v=tIuj-oMN-Fk - Dr. Jason Fung - 'Therapeutic Fasting - Solving the Two-Compartment Problem'