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Energy rush/light feeling during fasting?

by (787)
Updated about 19 hours ago
Created January 27, 2014 at 3:41 PM

Does anyone know what causes the energy burst & feeling of your body being light during fasting/IF?

I'm thinking it's when you start to burn fat for energy/enter ketosis?

When I approach 18+ hours fasting there's a kind of shift, I suddenly feel lighter & mentally clearer, I've also felt this quite reliably after intense exercise followed by a very cold shower, which i'd imagine both trigger fat burning. The other day I did HIIT, cold shower, and then ate some coconut oil & butter straight and it seemed to amplify the effect for a few hours, so it must be ketosis right?

The only other thing I feel it could be is related to circulation, or maybe both as ketosis increases blood flow to the brain

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480 · January 29, 2014 at 3:18 PM

Yes this is true, lean people still have tens of thousands of calories in storage. My point is that while one is still overweight the adipocytes can hold several hundred thousand calories of storage, so there is certainly a much greater ability to withstand hunger. I noticed this when I first started fasting and I was overweight, I could fast for 48hrs (and I mean no food at all) without a problem. These days it's a lot harder. Rationally, it is likely the leptin, after all, adipocytes release leptin in proportion to the amount of adiposity. Less leptin = more hunger in non-obese subjects.

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787 · January 29, 2014 at 8:00 AM

Fasting is excellent, i usually do a 36 hour fast once per week or a 3/4 day fast once per month

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787 · January 29, 2014 at 7:24 AM

Yeah that makes a lot of sense, i think in practice though there's an energy dip when you run out of dietary fat & switch over to body fat, although maybe after being properly adapted this isn't such a big switch. I do know that when i fast for a few days i totally lose hunger, so i must have some stores of energy.

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0 · January 29, 2014 at 1:02 AM

You have several TENS of thousands worth of calories of body fat if you're slim. I highly doubt you're "low" on fuel unless you're literally starving yourself.

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480 · January 28, 2014 at 7:43 PM

Fasting is actually quite beneficial for your health, it has been shown to extend lifespan in a multitude of experiments across a wide range of species. I would highly recommend it. Just don't forget to eat every now and then. And by the way, you might find that drinking plenty of water or unsweetened black, green, or white tea makes it much easier, specially the tea since it diminishes appetite to a degree.

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787 · January 28, 2014 at 5:42 PM

Yeah my intolerance of carbs and general health is why i'm doing this aswell, but I definitely don't want to lose much weight, i could do with losing the last bit of belly fat but I could also do with a tad more muscle so may throw in some carbs/extra protein eventually, but not for a while, I want to fully adapt to ketogenic then if I find I want to build a bit i'll have to tweak from there.

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480 · January 28, 2014 at 4:54 PM

By the way that extra oil, if taken during a low carb diet, will not produce any weight gain. This is a very bad strategy for gaining weight. Carbs are the most expedient way of achieving this goal. I stay away form carbs and excess protein however, I am dieting because I am trying to avoid degenerative diseases and aging. I am actually doing this more for longevity than any other motive. I don't care about being skinny or ripped or whatever, I just want to delay the bad stuff for as long as possible.

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480 · January 28, 2014 at 4:46 PM

I've been eating like this for roughly a year now. The effects have been quite good, even if that's just my anecdotal evidence. I have remained extremely lean, actually I'm borderline underweight as my BMI has dropped down to 20 (140lbs 5'10"). Cholesterol levels are 150mg/dl total, 78mg/dl LDL, 61 mg/dl HDL, 53mg/dl triglycerides. Considering that I barely exercise due to the fact that I am a software developer and sit down all day long, the results have been extremely surprising to say the least. When I started I was 180lbs and had a noticeable gut, it's gone now.

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787 · January 28, 2014 at 4:33 PM

How long have you been eating this way? Has it had the desired effects? It's good to speak to someone that eats like this. I actually read an article yesterday where the doctor recommended 100ml of oil a day for everyone, those wanting to lose or gain

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480 · January 28, 2014 at 2:17 PM

I like your approach, I basically do the same exact thing. And yes I can tell you from experience, if you have low body fat, you do need quite a good amount of fat to keep up energy levels. I do the same thing as you, either drink extra virgin olive oil straight up from those little 88ml (3.5oz) olive oil bottles, or eat a stick of butter to keep me going. I repeat whenever my energy dips again, but it usually lasts for a good while after that. By the way, veggies with fat is where it's at. Seriously good stuff right there, no better way to enjoy them.

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787 · January 28, 2014 at 8:19 AM

Yes a few hours after eating the pure fat my energy dipped fast maybe as i don't have much bodyfat, i'm a slim ectomorph so i really have to make sure i keep eating lots & lots of fat, i'm enjoying pure butter, 3 table spoons of coco oil daily, gonna make my first mayo tonight to eat with raw veggies. I also discovered last night that the tastiest way of having a big salad is drenched in fat! I think i'm also already seeing the benefits of lowering my protein by the way, i feel much better & well rested

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2 Answers

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0 · January 28, 2014 at 6:53 PM

I get this feeling whenever I skip a meal I've been eating daily for a while. It feels really good and all I can say about it is that because it's such a positive feeling, I believe I should fast more often.

Be157308a0438e382b88d9db4c12ab30
480 · January 28, 2014 at 7:43 PM

Fasting is actually quite beneficial for your health, it has been shown to extend lifespan in a multitude of experiments across a wide range of species. I would highly recommend it. Just don't forget to eat every now and then. And by the way, you might find that drinking plenty of water or unsweetened black, green, or white tea makes it much easier, specially the tea since it diminishes appetite to a degree.

De1095b2ba29c1035f00428cbfe3cc7c
787 · January 29, 2014 at 8:00 AM

Fasting is excellent, i usually do a 36 hour fast once per week or a 3/4 day fast once per month

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480 · January 27, 2014 at 10:26 PM

I know what you are describing, I have experienced this as well. It usually happens while fat reserves are not too low since the body has plenty of fuel to operate on. However, if body fat dips too low, you might feel somewhat less euphoric. If I had to place a bet I would say that you are indeed in ketosis. 18 hour fasts are usually sufficiently long enough to deplete your glycogen stores assuming that you are not overweight and you eat a low-carb diet. If you follow this by ingesting a large amount of pure fat, the you will most definitely induce ketosis.

This procedure is very similar to how they introduce epileptic children to a ketogenic diet. It is first begun by fasting, in order to reduce glucose levels, which also reduces insulin levels accordingly (the body does this in order to maintain glucose homeostasis), and then high-fat, low-carb food is introduced methodically in order to assure that the patient stays in ketosis and is not kicked out by excess carb consumption or excess protein which would trigger high glucose levels via gluconeogenesis.

D371623b5671d11fa678b201ff23442b
0 · January 29, 2014 at 1:02 AM

You have several TENS of thousands worth of calories of body fat if you're slim. I highly doubt you're "low" on fuel unless you're literally starving yourself.

De1095b2ba29c1035f00428cbfe3cc7c
787 · January 28, 2014 at 8:19 AM

Yes a few hours after eating the pure fat my energy dipped fast maybe as i don't have much bodyfat, i'm a slim ectomorph so i really have to make sure i keep eating lots & lots of fat, i'm enjoying pure butter, 3 table spoons of coco oil daily, gonna make my first mayo tonight to eat with raw veggies. I also discovered last night that the tastiest way of having a big salad is drenched in fat! I think i'm also already seeing the benefits of lowering my protein by the way, i feel much better & well rested

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