The Naked Scientists

The Naked Scientists Forum

Author Topic: will the body self-consume if needed?  (Read 4911 times)

Offline Emilio Romero

  • Sr. Member
  • ****
  • Posts: 224
    • View Profile
will the body self-consume if needed?
« on: 26/02/2009 21:44:21 »



I’ve been a runner for over ten years (OK --unofficial poll-- how many runners do we have here? Fess up), and I’ve heard two sides of a story:
That the body will auto-nourish consuming “itself” when there is a sufficient caloric deficit, or that it simply will not, since it’s impossible.
Furthermore, I once found an article that stated “no healthy, well-nourished individual will use its muscular protein to metabolize. The assumption, that a calorie-reduced diet and accompanying endurance training will lead the body to burn its muscular protein, is not true under any circumstances. Muscle cells are only reduced through inactivity. This process is called atrophy”.
The latter sounds as if it makes sense... but where is the truth?
Help please, you’re my last hope.
Thanks
emilio



 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #1 on: 27/02/2009 05:03:18 »
Protein averages about 5% of the total energy expenditure; this can increase to 15% during long periods of intense physical work. Protein usage also increases when glycogen stores are low, in the liver, the protein is converted to glucose, in doing so, helps to maintain blood glucose levels. As glycogen stores are generally lowered when dieting or following a low-carbohydrate diet, it makes sense that more protein will be utilized for energy.
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #2 on: 27/02/2009 05:14:02 »
Quote
Probably the most important point to remember about cortisol and diet is that when glycogen (stored carbohydrate) in the body gets low, cortisol levels rise. This makes perfect sense when you keep in mind that carbohydrate is your body's preferred source of calories. When the body does not have enough precious carbohydrates available, alternative sources of energy must be found. The only other options the body has for calories are fat and protein. Rising cortisol levels will speed up the breakdown of lean tissue (protein) in your body and convert the released amino acids into glucose (carbohydrate) for fuel. At the same time, rising cortisol will speed up the release of free fatty acids (from your body fat stores), making more body fat available for aerobic metabolism.

http://www.bodybuilding.com/fun/issa79.htm
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #3 on: 27/02/2009 05:22:04 »
So the truth is: The body will burn its muscular protein if you're on a calorie-reduced diet. Better start eating :)
 

Offline Don_1

  • Neilep Level Member
  • ******
  • Posts: 6890
  • Thanked: 7 times
  • A stupid comment for every occasion.
    • View Profile
    • Knight Light Haulage
will the body self-consume if needed?
« Reply #4 on: 27/02/2009 10:35:56 »
I will do as you suggest C4M

 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #5 on: 27/02/2009 10:43:29 »
Watch out for this bloke:

 

Offline Don_1

  • Neilep Level Member
  • ******
  • Posts: 6890
  • Thanked: 7 times
  • A stupid comment for every occasion.
    • View Profile
    • Knight Light Haulage
will the body self-consume if needed?
« Reply #6 on: 27/02/2009 10:54:25 »
Stone me! A Michelin Giraffe!
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #7 on: 27/02/2009 10:56:43 »
A Michelin Giraffe!
A what? ?????????
 

Offline Don_1

  • Neilep Level Member
  • ******
  • Posts: 6890
  • Thanked: 7 times
  • A stupid comment for every occasion.
    • View Profile
    • Knight Light Haulage
will the body self-consume if needed?
« Reply #8 on: 27/02/2009 11:00:04 »
Michelin (French tyre manufacturer) use the Michelin Man for ads, have you never seen it?
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #9 on: 27/02/2009 11:02:33 »
I have never actaully seen a picture of Michelin but I've certainly heard about it/him/her.

I can certainly see the resemblance to the giraffe.
 

Offline dentstudent

  • Neilep Level Member
  • ******
  • Posts: 3146
  • FOGger to the unsuspecting
    • View Profile
will the body self-consume if needed?
« Reply #10 on: 27/02/2009 11:18:21 »
The STB appears to be very healthy and in action this morning!
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #11 on: 27/02/2009 11:22:19 »
Don_1 just had to shove his big mouth in.
 

Offline Emilio Romero

  • Sr. Member
  • ****
  • Posts: 224
    • View Profile
will the body self-consume if needed?
« Reply #12 on: 27/02/2009 13:31:55 »
So the truth is: The body will burn its muscular protein if you're on a calorie-reduced diet. Better start eating :)
Ok, thanks.
However, which would it consume first, fat or muscle?

 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
will the body self-consume if needed?
« Reply #13 on: 27/02/2009 23:28:14 »
I am fairly certain that it would be the fats first! Seeing as they produce nearly twice as much energy as the same amount of carbohydrates.
 

The Naked Scientists Forum

will the body self-consume if needed?
« Reply #13 on: 27/02/2009 23:28:14 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums