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Q: blood sugar ( Answered,   1 Comment )
Subject: blood sugar
Category: Health
Asked by: flappy-ga
List Price: $2.00
Posted: 11 Dec 2004 07:47 PST
Expires: 10 Jan 2005 07:47 PST
Question ID: 441256
what happens to your blood sugar when you starve. How does the body
try to maintain
homeostasis when this occurs
Subject: Re: blood sugar
Answered By: raisingmyhand-ga on 13 Dec 2004 16:49 PST
Hello Flappy, 

You have asked a very interesting question. I will provide you an
outline here and you can post additional questions if you need more

Overview: In fasting, the blood sugar (called glucose) will start to
drop but then the body will respond to keep it in the normal range.
The body can keep glucose in the blood by (1) using stored sugar
(called glycogen), and by (2) making new sugar (called
gluconeogenesis). If these processes do not supply enough glucose, the
body will start making an alternate form of energy for the brain and
muscles, the energy comes from ketone bodies made in the liver.

During the first hours of fasting, the blood sugar begins to drop as
glucose gets used up. In response to the low blood sugar, the pancreas
releases a hormone called glucagon. Glucagon signals the liver (and
kidneys) to start breaking down glycogen. This is called glycolysis.
Glycogen is basically a bunch of glucose molecules joined together for
storage. Glycogen gets turned into glucose and released into the

As the glycogen supplies start to get used up (within about 12 hours),
the liver begins to make glucose in a process called gluconeogenesis.
The liver makes new glucose from uses amino acids, which come from
protein breakdown.

During fasting, fat will also get used for energy but it doesn't get
turned into glucose.

After about 16-32 hours of fasting, the liver begins to turn fats into
ketone bodies. These ketone bodies can be used for energy by muscle
and the brain when there is not a lot enough glucose available.

You can see that the live plays a very key role in maintaining the
body's glucose levels. Through most of fasting, the glucose
concentration in the blood will stay at a pretty normal level.

I hope this is helpful, 


Clarification of Answer by raisingmyhand-ga on 13 Dec 2004 17:04 PST
Just wanted to add a reference:
Subject: Re: blood sugar
From: flash_2010-ga on 13 Dec 2004 14:08 PST
When you starve, your bodie change the lipid in sugar to maintain que
quatity of sugar to be sure that your body can change the sugar in
energy. The energy provide by the sugar can maintain the homeostasis.
And when you are out of lipid (very rare), you burn protein (like your
muscle). And after, you die. Because you are out of energy like a car
with no fuel.

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