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Old Wed, May-19-10, 06:49
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teaser teaser is offline
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Posts: 15,075
 
Plan: mostly milkfat
Stats: 190/152.4/154 Male 67inches
BF:
Progress: 104%
Location: Ontario
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Quote:
Originally Posted by cbcb
As an aside, somewhere in the middle of reading posts in this thread from April/May, I started wondering about if and how much the burning of muscle spikes insulin (hello vicious stall circle), at least in some people, the way that excess protein in the diet can. It doesn't really answer your question at all, but your question made me think of it.


If you look at end stage starvation, where body fat levels are very low, and lean tissue is wasting away, maybe this relates. During normal fasting leucine tends to build up in the blood; this might be a signal to the system that the body is starving, things need to slow down. This is sort of consistent with the idea that too many calories from protein vs carbohydrate or fat might induce reduced levels of T3; lots of protein being oxidized being a signal of starvation. At least in some people.

Somebody mentioned also carbohydrate being needed to burn fat. This is based on the need for glucose to synthesize oxaloacetate, which pairs with acetyl-CoA to produce citric acid. Glucose is probably only needed for this when insulin signalling is high. Oxaloacetate can also be produced within the Citric Acid cycle itself. But, this involves the degradation of proteins-- it could be as easily said that fat burns in the flame of proteins, as that it burns in the flame of carbohydrate. So it makes sense that a false signal that lean mass is wasting away and needs to be conserved might slow down fat metabolism, as well.
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