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How long does the 'switchover to burning fat' from being a carb burner take?

Answered on August 19, 2014
Created January 13, 2011 at 6:13 PM

Hi all, my first time here... I've been 99% paleo for 2 weeks now... Previously I never calorie counted... But now I've hardly any appetite... Some days over the last two weeks I've had like 1200 calorie days... I'm 5'9" and weigh 11.5 stones (74 kgs.. I'm English) I also didi a 24 hour fast without any hunger...

Just wondering if the substantial drop in normal and when does the bodies preferred fuel source switch to fats?

Many thanks Phil mulligan

6899763c85871bba323530a314506a9d

(30)

on January 13, 2011
at 10:34 PM

Very interesting link... Cheers... I've bookmarked it for future reference

6899763c85871bba323530a314506a9d

(30)

on January 13, 2011
at 10:06 PM

Cheers for the input... Once I'm fitter again I'll look into carving for workouts... ( been off the ironman training schedule for 8 months now... Just getting better... Turns out I've a rheumatoid type arthritis) it's the meds finally in my system or the dietreally is helping... I'm so so surprised how few calories I'm desiring!

6899763c85871bba323530a314506a9d

(30)

on January 13, 2011
at 10:01 PM

Many thanks... Well my 1% was the other two evenings I ate about 10 ritz crackers (about 150 calories ) I just thought I'd have dropped about a kilo I suppose....

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5 Answers

1
667f6c030b0245d71d8ef50c72b097dc

(15976)

on January 13, 2011
at 07:39 PM

I think, and this is based on what I've read and my self experimentation, that there are two things:

  1. Getting into ketosis and

  2. You getting used burning fat for energy essentially all the time.

For number one, you can enter ketosis definitely within one waking span. As long as you don't eat much or any starch and do at least a little of some activity that will burn up whatever glucose is around your body ready for burning. As soon as your body gets through that glucose and starts burning your fat stores for energy, you are in ketosis. As soon as you eat sugar you are going to stop burning fat and burn that newly consumed carb. Pretty straight forward. This back and forth of going in and out of ketosis is completely normal, prolly happens to lots of people unbeknownst to them, and is not at all a problem.

For number two though I found that it took about one to two whole months for my mind, I suppose I'd say, to get used to the new way you will feel after continuously eating low carb and being in ketosis a lot, if not all, of the time. This would include the lack of hunger, the sometimes depending on the individual brain fog, sometimes lack of energy, etc.

After as I say one or two months I was exercising with heavy weights and low repetitions with no problem. Living life with no energy crashes EVER and seriously close to NO feelings of urgent hunger ever. Regardless of the amount of calories I was taking in (not to say I was skimping, on the contrary I was prolly taking 4-5k calories per day of meat and fat and green veg).

If you're curious, I am back on starch PWO and also at dinner. I'm prolly in the ~200 grams of starchy carb per day range now and I wil indeed say that I get hungry now like I used to. I am eating the starch to see if I get a performance boost lifting.

6899763c85871bba323530a314506a9d

(30)

on January 13, 2011
at 10:06 PM

Cheers for the input... Once I'm fitter again I'll look into carving for workouts... ( been off the ironman training schedule for 8 months now... Just getting better... Turns out I've a rheumatoid type arthritis) it's the meds finally in my system or the dietreally is helping... I'm so so surprised how few calories I'm desiring!

0
26f1c6e9fbecc4ac6948f8f395979a81

(503)

on January 14, 2011
at 02:29 AM

This will probably vary by individual but my personal experience was that I saw a drop in body fat after about 2 weeks. (It was pretty awesome! I was relatively fit to start, but I got rid of that last little bit of fat that wasn't responding to exercise. I'm in single digits now. It really is mostly about the food you eat.) I'm eating moderate carbs however (around the 90g mark) from both fruit and veggies.

0
5e36f73c3f95eb4ea13a009f4936449f

(8280)

on January 14, 2011
at 12:49 AM

A few things.

1) Ketogenic is low/no carbs. Paleo diets aren't necessarily Ketogenic.

2) If you've had a lifetime of high carb, it takes longer for the body to really switch to using ketones the first time. It's used to a constant stream of high carb, and will hold out on doing the enzyme/hormonal changes.

3) You have to go strict 100% low/no carbs to start (usually around 60grams a day, 100 grams max). You can't backslide even a little because it sabotages you.

4) Going strict no/low carb ketogenic, I take a day or two now (with 30min-1hr steady bicycling each day) before I see it on Ketostix. But it took around 10 days the first time I did it.

0
Medium avatar

on January 13, 2011
at 07:45 PM

Ketosis isn't remotely necessary for fat burning, in fact, people on the SAD are constantly burning fat from all of their fat cells, they just happen to be storing more at the same time. I don't believe that such a "switch" actually exists. Our adipocytes are far more dynamic than most realize.

As far as timing goes, your body's natural inclination is toward correct levels of insulin, satiety/appetite etc., though some may go through a short period of adjustment. It's not that paleo creates a uniquely fat-burning environment, it's that it removes the artificially high appetite/insulin/fat storage that carbohydrates create. You are in essence kicking out the supports that have elevated your fat levels and the result is a drop back to what you are designed to do. I don't know how to quantify the extent to which a diet is paleo, so I don't know what lies in your last 1%, but I would wager that you are already where you want to be unless you're still consuming fruit, though I kind of doubt it since you have such a manageable appetite.

6899763c85871bba323530a314506a9d

(30)

on January 13, 2011
at 10:01 PM

Many thanks... Well my 1% was the other two evenings I ate about 10 ritz crackers (about 150 calories ) I just thought I'd have dropped about a kilo I suppose....

0
1cbb6b2a813475d6c0b17fd5e898dc50

on January 13, 2011
at 06:56 PM

It probably varies for each individual but I have read a lot of forums where people use Keto Sticks and say they are in ketosis in as little as 3 days. I don't know how accurate they are either, so, in essence I don't know anything....lol. Here is a good link from Eades blog.

6899763c85871bba323530a314506a9d

(30)

on January 13, 2011
at 10:34 PM

Very interesting link... Cheers... I've bookmarked it for future reference

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