CrossFit Discussion Board  

Go Back   CrossFit Discussion Board > CrossFit Forum > Nutrition
CrossFit Home Forum Site Rules CrossFit FAQ Search Today's Posts Mark Forums Read

Nutrition Diet, supplements, weightloss, health & longevity

Reply
 
Thread Tools
Old 10-16-2006, 08:02 PM   #1
Kevin McKay
Member Kevin McKay is offline
 
Profile:
Join Date: Feb 2006
Location: albany   ca
Posts: 1,110
I came across this in the md.

"Basically, a diet high in fat activates the lipolytic (fat burning) enzymes in your body
and decreases the activity of the lipogenic (fat producing) enzymes. Dietary free fatty
acids and triglycerides become the body's main energy source. The triglycerides are
broken down to free fatty acids and some of the fatty acids are metabolized to
ketones, which in turn can be used for energy by body cells. The use of ketones for
energy is especially important to the brain that can only use glucose and ketones for
energy. In short, the free fatty acids and ketones take the place of glucose and the
triglycerides act like glycogen"

I always thought that the body could convert fat to glycogen. My question is does the body always use tryglicerides directly in the absense of glycogen or are there situations where it will convert fat to glycogen?

Thanks
  Reply With Quote
Old 10-17-2006, 02:46 AM   #2
Gerhard Lavin
Member Gerhard Lavin is offline
 
Profile:
Join Date: Jun 2005
Location: Berlin  Germany
Posts: 973
This link may answer your question http://academic.sun.ac.za/medphys/ketosis.htm
  Reply With Quote
Old 10-17-2006, 09:02 AM   #3
Charlie Jackson
Banned Charlie Jackson is offline
 
Profile:
Join Date: Mar 2006
Location: Santa Carlos  New Mexico
Posts: 204
where it will convert fat to glycogen?


The body can convert glycerol to glucose but it prefers to use amino acids for gluconeogenesis.

"Oxidation of fatty acids yields enormous amounts of energy on a molar basis, however, the carbons of the fatty acids cannot be utilized for net synthesis of glucose. The two carbon unit of acetyl-CoA derived from b-oxidation of fatty acids can be incorporated into the TCA cycle, however, during the TCA cycle two carbons are lost as CO2. Thus, explaining why fatty acids do not undergo net conversion to carbohydrate.

The glycerol backbone of lipids can be used for gluconeogenesis. This requires phosphorylation to glycerol-3-phosphate by glycerol kinase and dehydrogenation to dihydroxyacetone phosphate (DHAP) by glyceraldehyde-3-phosphate dehydrogenase(G3PDH). The G3PDH reaction is the same as that used in the transport of cytosolic reducing equivalents into the mitochondrion for use in oxidative phosphorylation. This transport pathway is called the glycerol-phosphate shuttle. The glycerol backbone of adipose tissue stored triacylgycerols is ensured of being used as a gluconeogenic substrate since adipose cells lack glycerol kinase. In fact adipocytes require a basal level of glycolysis in order to provide them with DHAP as an intermediate in the synthesis of triacyglycerols."

http://web.indstate.edu/thcme/mwking...eogenesis.html

(Message edited by cjackson on October 17, 2006)
  Reply With Quote
Old 10-17-2006, 01:48 PM   #4
Kevin McKay
Member Kevin McKay is offline
 
Profile:
Join Date: Feb 2006
Location: albany   ca
Posts: 1,110
Thanks Charlie
  Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Questions about diet and glycogen stores. Patrick Donnelly Nutrition 11 07-05-2007 08:28 PM
Convert executable, easily convert almost anything Neil Khant Community 4 05-03-2007 04:35 PM
Liver and muscle glycogen Stephen Kichuk Nutrition 1 03-31-2007 06:16 PM
Glycogen depletion (not a distance athlete) Matt DeMinico Nutrition 5 03-01-2007 07:41 AM
Glycogen Replenishment and the Zone Diet Matthew Nielsen Nutrition 19 01-04-2006 04:24 PM


All times are GMT -7. The time now is 02:36 AM.


Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
CrossFit is a registered trademark of CrossFit Inc.