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เครดิต ... 
Digestion of proteins
takes place in different stages.
The initial phase of protein digestion
and absorption occurs in the stomach and
the latter takes place in the small intestine.
************
Surplus Protein Calories In Diet
If protein requirements are exceeded by
protein intake,
the surplus amino acids may be converted
to glucose for energy use, or converted to
fatty acids and stored as adipose tissue.
**********************
Insufficient Protein In Diet
If we eat insufficient protein (not very likely
for most people), the body may break down
stored protein in the muscles and transport
the amino acids to the more vital organs,
as required.
Alternatively, if our energy intake falls
dangerously low,protein amino acids will be
taken from the muscles and sent to the liver
to be converted into glucose.
see this
http://www.annecollins.com/digestive-system/digestion-of-protein.htm
**********************
***Amino Acids Put To Use
Once in the blood, the amino acids are carried
by both the red blood cells and by the liquid
part of the blood, called the plasma.
The amino acids are thereby distributed to all
the body tissues, where the various body cells
take what they need to repair and reform the
protein structures they need.
***The blood contains amino acids at all times.
Fasting does not clear them, and a high protein
diet does not materially increase them.
The body has a constant need for protein amino
acids, and it keeps a fairly uniform balance.
***Taking The Protein From The Muscles
The body's skeletal muscles act as an emergency
source of protein if insufficient amounts are
eaten. The body can break down its own muscle
tissue, and transport the amino acids gathered
from that muscle destruction to the more vital
organs, if necessary. (As an aside, recall that
we know that people on very low fat diets are
also, frequently and by default, on low protein
diets. This is because most of the rich sources
of protein in foods are also in sources of
dietary fat. These dieters lose their muscle
mass because their bodies cannibalize their
own muscles as a source of the proteins that
they need, but are not eating.)
**Problems Arising From Incomplete or Improper
Protein Digestion
Sometimes, instead of being properly broken
down into amino acids, small amounts of whole
or partial proteins are absorbed into the blood
The body wants amino acids, not whole proteins,
and whole proteins are viewed by the system as
an enemy. This is where we get the phrase
foreign protein. The presence of protein instead
of amino acids may lead to food allergies,
to a shock reaction called anaphylaxis
(anna-phil-AXIS), to other symptoms typical of
an allergy, such as sneezing, breathing difficulties,
skin rashes, headaches, nausea, or even, in
severe cases, death. And these problems result
from just a very small amount of the food protein,
which doesn't belong there.
**Sometimes protein substances containing
nitrogen may reach the large intestine.
This may be undigested or partly digested food
residues, unabsorbed amino acids, unused
protein enzymes, or the protein of dead
bacteria. These protein substances will likely
be attacked by microorganisms (bacteria) that
live in the intestinal tract, and be decomposed
by the process called putrefaction
(pew-tra-FAC-tion). This often results in diarrhea.
**Waste Products of Protein Metabolism **
The destruction of proteins in the body gives
rise to two classes of waste products: nitrogenous
(ny-TRA-gin-us), those containing nitrogen, and
non-nitrogenous (non-ny-TRA-gin-us), those that
don't contain nitrogen. The non-nitrogenous
types of waste products are carbon dioxide and
water. Nitrogenous waste products only relate
to proteins since only proteins contain nitrogen.
**The nitrogenous waste products are known as
urea (yur-RE-ah), uric acid (yur-ick acid),
creatinine (cree-AT-tin-neen), and hippuric
acid (hip-PURE-ick acid). Urea is the major
nitrogenous waste product, making up some 80%
of it. Urea is formed in the liver, and is
excreted by the kidneys in the urine along
with the other types of protein waste products.
***************
http://www.carbsmart.com/pdigestion.html
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In the small intestine, there are other enzymes
that take over the charge of protein digestion
in the body. These enzymes aid in protein absorption,
by breaking the small protein molecules into amino acids.
Protein absorption rate is **faster** for animal origin foods,
rather than **vegetarian plant origin foods**,
perhaps because vegetable proteins usually contain
cellulose covering.
****
http://www.iloveindia.com/nutrition/protein/protein-digestion.html
*****
Dextrin .. ที่เป็นส่วนผสมหลักของ Weight-grainer
http://en.wikipedia.org/wiki/Dextrin
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TinyNu   
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| เขียนเมื่อ |
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22 ต.ค. 53 10:35:06
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๐๐๐๐๐ เมื่อ BMI ต่ำกว่า 20 อยากเพิ่มน้ำหนัก ๐๐๐๐๐
Whey Protein ...มีคำถามหลายกระทู้ อาทิ ทานเวร์โปรตีนอย่างไร ทานแล้วไม่ออกกำลังกายจะทำให้อ้วนหรือไม่ ? 
