1

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Does it mean you are burning fat for fuel?

Answered on August 19, 2014
Created January 11, 2012 at 3:20 AM

I have been keeps my carbs to under 50 for 2 weeks now, hoping to get close to ketosis. I decided to test myself, so I did a 48 hour fast, only water and tea, and I felt TERRIFIC the whole time, I thought i'd be weak and feel terrible, but I was full of energy the whole time. Does this mean I am adapted to burning fat? or something else? Just curious if I should keep incorporating this into my routine..

Thanks!

D07a525f9021f8d72bf6aaa52893c795

(1011)

on January 14, 2012
at 09:51 AM

Nice answer, Bill. Please could you tell us where you get the facts and figures - accrued, or single source?

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7 Answers

7
1c67bc28f4e44bbb8770b86df0463df3

on January 11, 2012
at 06:10 AM

Your body is ALWAYS burning fat except for in the presence of constant dietary carbohydrate.

Has your body been burning more fat than when you consumed carbs? Oh yes it is, 100% guaranteed.

Ketosis is for providing fuel to your brain, and yes, after 2 weeks of <50carbs and 48+hr fast, your most definetly IN ketosis.

You go into ketosis as soon as your liver runs out of glycogen (actually before). Your brain needs 120-100 grams of Carbs/day when you started this, and it got it from your liver glycogen+the 50 you ate for two weeks, plus it converted some from fat, plus it brokedown some dietary protein for glucose also.

Over a 4 week timespan, in the absence of dietary carbs, your brain reduces its need for glucose down to 30-40 grams. 20 comes from fat breakdown. The other 20 has to come from ingested (or muscle) protein or carbs, and the 70-90 other grams are replaced with ketone use.

D07a525f9021f8d72bf6aaa52893c795

(1011)

on January 14, 2012
at 09:51 AM

Nice answer, Bill. Please could you tell us where you get the facts and figures - accrued, or single source?

3
0d0842381492a41b2173a04014aae810

(4875)

on January 11, 2012
at 05:22 AM

I'd say yes, it sounds like you are. As AnarchyCaveman suggested, Ketostix can confirm if you really feel the need to know - however:

The way I think of it is: though you may or may not be in keto at the current moment, once you've adapted your body to the process of burning fat (ie, passed the "low carb flu" phase), you will notice that you have the metabolic flexibility to do what you damn well please, and nothing will stop you from feeling like a warrior at that point.

If you fast for too long you will gradually decline, though its sort of a gentle settling into a quiet, observant mode (think: sitting in the bushes, hunger knotting your stomach, waiting for anything edible to walk by), rather than a "crash", per se.

For me, this was the phase in which food really began to take a background role in my life. At times I'd even forget to eat, and then I'd refuel, and be on my way. You now have the control; you now have the flexibility to operate without being a slave to your fuel source.

I love that unparalleled focus that comes from long fasting, elevated ghrelin levels, and consuming pure fat (MCTs especially) while already deep into keto. Few things make me feel so animalistic.

1
77877f762c40637911396daa19b53094

(78467)

on January 14, 2012
at 08:39 AM

Forget fasting. Fasting can also burn off muscle. The paleo diet need not be so complicated. Just don't over eat.

1
286a4ff7c362241c5c4b020df4972212

on January 11, 2012
at 04:39 AM

If you are feeling great you could be keto adapted - But you probably need to go lower than 50 carbs to do so. My spot is about 20 carbs a day. So yes once you are in Ketosis and you feel comfortable - you are a fatburner - cool hey!

1
90f66d30d977b07694403b469b3f85c5

on January 11, 2012
at 04:33 AM

Do you use ketostix? You can test your urine for the presene of ketone bodies. I don't do this much anymore, but I did for the first few months of Paleo to try to understand what was working. You can get the test sticks at a pharmacy for about $12 for 50 of them.

0
Dfada6fe4982ab3b7557172f20632da8

(5332)

on January 12, 2012
at 04:15 PM

That's a good sign that you're pretty well adapted. You don't need to buy anything or measure exact ketone levels to know that. Depending on your goals, there's a lot to recommend occasional fasting. As Raney implies, it can be hard to maintain regular meals when you don't really need them!

-1
77877f762c40637911396daa19b53094

(78467)

on January 14, 2012
at 05:31 AM

Surely,by keeping carbs low, you are making terrific progress.I think you should continue this for keeping your health sound.Seeing your post I'm getting motivated.Thanks man.

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