3

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Does Intermittent Fasting Induce Ketosis?

Answered on August 19, 2014
Created January 24, 2011 at 3:49 PM

So I searched around for a while but couldn't find a definitive answer (maybe there isn't one), does intermittent fasting induce ketosis? I usually IF overnight until lunch-time. I've read that sleep often induces ketosis. Am I in ketosis at the end of that fast?

E35e3d76547b18096a59c90029e7e107

(15613)

on January 22, 2012
at 08:25 AM

I like the fact that they contrast the 'normal diet' with high fat at least, rather than insisting that the SAD is high fat.

B0fe7b5a9a197cd293978150cbd9055f

(8938)

on January 21, 2012
at 07:24 PM

"Fed normal diet" doesn't really say anything does it :P?

03281912f1cb9e4e771a8a83af302e3a

(1204)

on January 30, 2011
at 03:27 AM

I'm not sure about the depth, but I judge by the sudden energy level increase, mental clarity, and clear and copious urine. It's not as accurate as a ketone stick, but in the same ball park.

5de2fffda92c0bf2be7ede10cad55546

(1781)

on January 29, 2011
at 01:45 PM

How do you measure that you're in ketosis and the depth?

E35e3d76547b18096a59c90029e7e107

(15613)

on January 24, 2011
at 07:20 PM

@Travis It does in the short-medium term, but I remember reading somewhere that over time the body adapts to metabolise MCT in much the same way that it metabolises LCT, but I'll need to look it up.

Medium avatar

(39831)

on January 24, 2011
at 07:10 PM

I think eating certain highly ketogenic fats like coconut oil will lead to a high concentration of ketones without necessarily even cutting back too far on carbs.

B485f0cf678c0b420941e883adfea28d

(304)

on January 24, 2011
at 07:00 PM

Cool table, thanks for this!

  • B485f0cf678c0b420941e883adfea28d

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4 Answers

best answer

12
E35e3d76547b18096a59c90029e7e107

(15613)

on January 24, 2011
at 04:23 PM

The Health Correlator blog has a good table for this:

does-intermittent-fasting-induce-ketosis?

As you can see, people fasted for up to 24 hours have very slight ketone production, whereas those fasted for 2-3 days have relatively high ketone levels, but the upper end only the same as the upper end of those fed a high fat diet unfasted. I suspect that a big factor would be how much carbohydrate you're storing before fasting, which would determine whether or not you actually need to enter ketosis while asleep. From the look of the table (I can't see any more details since it's from an encyclopedia, not a journal paper) it would seem that exercising (perhaps after the end of your fast), could induce more ketosis than a short (12-24 hour) fast.

E35e3d76547b18096a59c90029e7e107

(15613)

on January 24, 2011
at 07:20 PM

@Travis It does in the short-medium term, but I remember reading somewhere that over time the body adapts to metabolise MCT in much the same way that it metabolises LCT, but I'll need to look it up.

Medium avatar

(39831)

on January 24, 2011
at 07:10 PM

I think eating certain highly ketogenic fats like coconut oil will lead to a high concentration of ketones without necessarily even cutting back too far on carbs.

B485f0cf678c0b420941e883adfea28d

(304)

on January 24, 2011
at 07:00 PM

Cool table, thanks for this!

B0fe7b5a9a197cd293978150cbd9055f

(8938)

on January 21, 2012
at 07:24 PM

"Fed normal diet" doesn't really say anything does it :P?

E35e3d76547b18096a59c90029e7e107

(15613)

on January 22, 2012
at 08:25 AM

I like the fact that they contrast the 'normal diet' with high fat at least, rather than insisting that the SAD is high fat.

2
03281912f1cb9e4e771a8a83af302e3a

(1204)

on January 28, 2011
at 04:13 PM

In my personal observation, fasting for 15 hours everyday for three days along side a low carb diet high in good fat, and lots of black coffee sets me into Ketosis. I also workout while still fasted.

03281912f1cb9e4e771a8a83af302e3a

(1204)

on January 30, 2011
at 03:27 AM

I'm not sure about the depth, but I judge by the sudden energy level increase, mental clarity, and clear and copious urine. It's not as accurate as a ketone stick, but in the same ball park.

5de2fffda92c0bf2be7ede10cad55546

(1781)

on January 29, 2011
at 01:45 PM

How do you measure that you're in ketosis and the depth?

1
45ec017364fe7067b1b4e5d4475d96a2

(10)

on April 05, 2012
at 01:55 AM

After exercising at the very end of a 20-hour fast, I showed a small amount of ketones, even though I am not on any sort low carb diet (low calorie, but not that low) and probably consume 90% of my calories in carbs.

-1
Fa75a752be18ead685467886479c49a7

(-2)

on February 28, 2013
at 08:31 PM

you should try bulletproof IF

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