Never over two years did I feel any of the mental clarity or more energy you speak of. I follow guys like Cole (snake diet) and even he speaks of the feeling of dying and lying in bed shivering on a 5-7 day.
Are you sure about the metal clarity and energy levels, because I and the folks I know who fast don't seem to have those affects.
This is dangerous and please don't encourage others to do only water fast. Pure water fast is dangerous beyond 4 days or so.
You need to supplement minerals while on per-longed fast. Salt, magnesium and potassium are vital to regulatory processes in your body.
When your body uses up all reserves it will not be able to sustain those processes. It is serious business so please read up on the subject while trying anything longer than 3 days.
> feeling of dying and lying in bed shivering on a 5-7 day.
This is body telling you something is wrong, ignoring is outright stupid. Like ignoring that you are bleeding.
> I have fasted 100 lbs away Congratulations
"Starting in June 1965, Scottish man Angus Barbieri (1939 – 7 September 1990) fasted for 382 days. He lived on tea, coffee, soda water and vitamins, living at home in Tayport, Scotland, and frequently visiting Maryfield Hospital for medical evaluation. He lost 276 pounds (125 kg) and set a record for the length of a fast."
I’m about to give up on total fasts and have bone broth a few times a day for the minerals.
Keen to know if we have learned more in this space
https://medlineplus.gov/ency/article/000394.htm
Magnesium and potasium main but not only function is to regulate heart beat. Lack of them might lead to arrhythmia and other complications.
Not sure about muscle loss.
If you supplement minerals and listen to you body response, then you can fast as long as you have fat stores in your body.
Its only dangerous if you don't know what you are doing or ignoring signals from your body. Lightheadedness is common thing people report or /r/fasting/ and almost always they don't take salt while fasting.
But I am not an expert, it feels like I have done more reading about fasting then actual fasting. So don't take advice from strangers (especially /r/fasting or worse dryfasting nutcases).
Your brain runs on carbs. The easiest source of carbs is carb rich food. This is why hangry people seem to want nothing but cookies & candy IMO. But your body can only hold a limited amount of free carbs at any time. Meanwhile, your liver can convert fat to carbs to feed your brain, and your body can hold a virtually unlimited amount of fat. This pathway is more difficult, so you have to train your body to use it.
So I don't think it makes you smarter or more energetic. But it does make you more stable & help avoid the crash.
Which actually brings me to another point; the brain does not run exclusively on carbs (glucose) - it absolutely has the ability to (and does) functions well on ketones. This is why ketogenic diets can work for many people.
But yes, there's lots of bio-chemical mechanisms that get kicked off when you're fasting for an extended period, so it could be something else that's unique to the people who experience the euphoria.
I am not sure if you've come across this concept, but "Metabolic Flexibility" seems to be trying to explain some of the "after burner" affects of switching around my dieting habits. Where I am no longer exercising strict caloric restrictions, or fasting on a regimen, but I am still observing some of the benefits of when I switched over. (Less bloating, more energetic even after a large meal, less voracious appetite on normal days).
Its a state where your body and mind need to be the sharpest in order to catch food. Or else due to lack of fuel you will enter actual starvation (no fat reserves).
When you have reduced calories intake ~~500kcal a day you are signaling to your body that you can find/catch food but there is not a lot of it. Your metabolism will slow down in order to adjust to reduce calories. You loose muscle mass much faster than when not eating at all.
I have done multiple >3 days fasts and I havent experienced this sharpness feeling though. It seems some people do and some don't.
Also worth mentioning keto is natural diet of Eskimo people, they survived generations eating seal's meat and fat. So keto is not some crazy nutjob diet invention of 21st cent.
On top of this, once you use up all your glycogen, your body enters a period of autophagy which causes disfunctioning cells and protein fragments to become broken down and reused. This causes your body to function more efficiently, including your brain.
I wonder if, if you are not a big eater, then the difference might be less than if you tended to be full of food, digesting away all day and night. Similarly, if there's not a lot of fat on you maybe, rather than burning fat with an energy boost, you end up burning muscle and feel tired?
I think I also just become more irritable if it's been too long since the last time I ate. It definitely doesn't seem to improve mental acuity for me, and any kind of physical activity is just going to feel worse. I've never tried any kind of a formal fast, though, so I don't know if there's something to planned schedules that makes it different.
I can kind of see how I might, under some circumstances, enter some kind of a state of quicker thinking after fasting, but I think it would be something similar to sleep deprivation, where you get perhaps a bit "hyper". That's not really a state I necessarily strive for either.
I've also never been overweight, and have always had more trouble gaining weight than getting rid of it. I wonder if that has something to do with it. I suppose the metabolism might be different if you've got some fat stores vs. if you're rather low-fat.
I can understand how fasting could e.g. have differential effects on cancer cells and thus be useful in specific circumstances. I also understand that people have rather different reactions, so I don't doubt that some people achieve some kind of a state that feels good or useful by fasting. But I don't really understand the hype, or calling it a panacea.
Each time I hit that point I get the clarity and energy, and remember that it happens each time. Pretty interesting. So much energy I can't sleep and end up eating when I can't sleep which breaks the fast.
I am only 5kgs over weight at this point if that is relevant for anyone.
