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Losing Weight

The Carb Cycling Diet

The Carb Cycling Diet

  • July 31, 2010 11:56 am
  • 5 comments

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The carb cycling diet plan is a topic that comes up again and again when people talk about building muscle while losing fat. But is the success you see with this really due to carb cycling?

What Is The Carb Cycling Diet?

The whole idea behind the carb cycling diet and what its proponents believe in is that through this diet you can influence your body’s leptin level.

Leptin is a hormone that plays a key role in regulating hunger and energy expenditure. To put it simply: The more leptin in your body, the less hunger you have.

Very Little Calories

Will Brink, who advocates the idea in his book Fat Loss Revealed, cites this study as proof that it works. I had a close look at it and found that it examined men who were on a very low calorie diet and had leptin artificially administered.

The stress here truly being on a very low calorie diet, as the study itself says:

[…] Exogenous leptin resulted in additional weight loss only during severe energy restriction in the present study but failed to significantly affect weight loss during mild hypoenergetic conditions in the previous study […]

This means that even when the leptin level was artificially raised through injections, it had no effect on those that had just a slight caloric deficit. You need to go way below your basal metabolic rate (BMR, the energy required for basic body processes) to make it work.

This is not healthy and for the study’s subjects also went hand-in-hand with a loss of fat-free mass (FFM), including muscle:

Conservation of FFM, which was observed in rodents treated with leptin, was not observed in the present study, in which both treatment groups lost equal amounts of FFM after 6 wk of severe energy restriction. The loss of FFM in both groups was within the normal physiologic range of ~25% of total body weight loss.

When via Facebook I asked Mr. Brink about this, he refused to answer.

No Scientific Proof

To make this short: It is very unlikely that by merely switching between low carb / high carb days you can influence your leptin level in a noticeable fashion. At least there is no scientific research that proves it.

The effect you see from doing carb cycling could very well be attributed to simply having a slight caloric deficit through a strict control of daily calories and providing enough protein and resistance training to preserve muscle. You can have that with much less trouble.

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Latest Comments

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5 Comments

  1. Uglok says:
    July 31, 2010 at 7:41 pm

    Couldn’t agree more. I understand why scooby posted that video, but it couldn’t have been much more foolish exactly because there are far too many people out there who jump in headfirst because 1 – they see him doing it and 2 – they see it work for him!

    Which comes back to lots of questions on the forum from people who clearly don’t have a clue – and worse, some very sketchy/unhealthy diet plans people (and undernourished growing teens!) are trying to stick to.

    Reply
    • evilcyber says:
      August 1, 2010 at 7:13 pm

      Yes, and I think that’s where some people misunderstand us: What we say is not gospel.

      Reply
    • Scooby Werkstatt says:
      August 27, 2010 at 11:20 pm

      Thru my entire website I try to stress that in bodybuilding you have to use your brain and think, everywhere I can I stress that bodybuilding is as much about reading, researching and thinking as it is about pumping iron. If I were to prune out everything that people could follow blindly without thinking, my website would be very, very small indeed.

      Reply
  2. Canadianguy says:
    August 8, 2011 at 1:57 pm

    as I always said. Carb cycling works because people force themselves to use a scale to measure their food intake. With that it works.

    Reply
    • evilcyber says:
      August 8, 2011 at 4:09 pm

      Yes, that is in my opinion as well what it comes down to.

      Reply

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