Why does protein isn't a source of energy?

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dorratz
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Why does protein isn't a source of energy?

Post by dorratz » Sun Apr 16, 2006 11:19 pm

Hello everybody!

I have a question:

I've read that the same amount of protein and carbonhydrate gives the same energy amount. So, why does protein isn't a source of energy like the carbonhydrate? is it because his huge molecule that can't pass through the cell's membrans in order to be used in the respiration process? or is it because he has many other functions - such as building muscles, tissues, hormones, enzymes etc...

What is the reason for that?

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mith
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Post by mith » Mon Apr 17, 2006 1:45 am

no, it can be used as energy, it's just not as handy
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Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
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kiekyon
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Re: Why does protein isn't a source of energy?

Post by kiekyon » Mon Apr 17, 2006 12:20 pm

dorratz wrote:Hello everybody!

I have a question:

I've read that the same amount of protein and carbonhydrate gives the same energy amount. So, why does protein isn't a source of energy like the carbonhydrate? is it because his huge molecule that can't pass through the cell's membrans in order to be used in the respiration process? or is it because he has many other functions - such as building muscles, tissues, hormones, enzymes etc...

What is the reason for that?


i think it is the second reason that u mention,

sdekivit
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Post by sdekivit » Mon Apr 17, 2006 1:21 pm

why use proteins when lipids yield much more energy ?

kiekyon
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Post by kiekyon » Tue Apr 18, 2006 1:33 pm

sdekivit wrote:why use proteins when lipids yield much more energy ?


because lipid can be stored for emergency use more effectively, lipid is not soluble in water so it is lighter than polysaccharide.

hence, in case of starvation, our body will first use up, our polysaccharide, then our lipid, and finally your enzymes, hormones etc will be converted back to protein to be used as energy source,
then, sorry to say, u die

:wink: :wink: :wink:

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