UNIT 1: QUALITY PROTEIN
SUMMARY FACTS
WHY START WITH THE PROTEIN?
Any person who has been vegetarian for a period of time may feel bored
with the question, "Where did you get your protein?" Now the question
should be, "What do you do to avoid too much protein
many? "Although protein is the building for most of the substances in the body
humans (as well as with animals and plants), but the protein is not necessary
consumed in large quantities. Indeed, this fact may be one
The strongest reason for the debate on nutrition related to a vegetarian diet
(Free of meat) and vegan (free from all elements of the animal). Is something ironic
that the nutrients that are often considered lacking in a vegetarian diet would likely
acceptable to the public.
Protein is an important substance in the body. For example, enzymes, chemical compounds
describes the elements in the food, all made of protein. Nevertheless,
these proteins, as well as all the proteins in the body, built in the body of
food components that had been digested and then collected again. Protein
not used or needed in their entirety. Advocacy that we need to consume
meat, eg beef, to develop enzymes necessary for digestion is
something that does not make sense, how well the case when we want to digest bites
first? In short, we do not require a specific type of protein, not protein
beef, chicken protein, milk protein, egg protein or even nuts. For
understand what we need from the protein, it takes a chemical explanation.
AMINO ACID COMPOSITION
Protein is a class of chemical compounds made of chain molecules
called amino acids. The human body uses approximately twenty types of acid
different amino. Each amino acid is made from principal carbon atoms (C), which clung
by the four following composition:
1. Atomic hydrogen (H) 2.Kelompok amino (NH2) 3.Kelompok acid (COOH) 4.Susunan no other fixed factors
The first three are always the same composition in each amino acid. Is the composition
that distinguish the four amino acids from one another. The composition of these side
may be as simple as a single hydrogen atom the other, or as complex content
additional several hydrogen atoms, oxygen, carbon and / or nitrogen. Two amino acid
also contains sulfur atom (S) in the composition of the side (this is referred to as
"Amino acid with a sulfur content"). So the equation is shared by all
amino acids, and also proteins, are carbon, hydrogen, and oxygen, which is also a
basic elements of carbohydrates and fats (lipids) but with an important addition in the form
nitrogen. And the protein can be used for energy (calories), but only after the nitrogen
released.
PROTEIN STRUCTURE
Proteins in food are made of dozens or even hundreds of amino acid molecules
joined together. Remember that there are only about 20 kinds of amino acids
important for human nutritional needs, so it is a series of them that make each
unique protein. The circuit is referred to as the primary structure of proteins. Like language
Indonesia, where the 26 letters combined differently to form millions of words.
Basically, there are millions of proteins. In the human body alone may
there are 50.000 different proteins (although only about 1,000 of those who have
identified in this paper - "science" is still much to know everything).
Protein also has a secondary arrangement, which is a form of the acid chain
acids. Chain is usually folded itself resembles a wrinkled paper, often also
there are cross linkages that keep the chain remains in place. Such pressure
heat can change the nature of these folds and the shape of the protein, but did not alter
amino acids and also the circuit.
ESSENTIAL AMINO ACID (EAA)
Of the twenty amino acids that are considered essential for human nutrition, there
nine are considered essential, which must be generated from food (eleventh
others can be generated with one another or from the essential amino acids only if necessary).
For this course, you not only need to memorize the names of the essential amino acids,
but also would be useful if able to recognize it. Nine essential amino acids
These are: valine, tryptophan, threonine, phenylalanine, methionine, lysine, leucine,
isoleucine, histidine. The human body is able to collect the rest as needed,
but the ninth is to be provided from the diet.
So actually the body's need for protein is a requirement for the number of
from each of these specific EAA. It is also necessary amount of additional material for
build proteins which will be converted into non essential amino acids. At the time
EAA needs are met, the proteins that contain them will
produce additional material in excess.
The relative amount of each EAA was dependent on the amount we need to
produce chemicals that are appropriate for each protein. EAA supplies most
called the restrictions a bit for the needs of amino acids for protein food, and this
the determination of the amount of chemical material.
Proverbial, imagine you are commissioned to make 100 signs, which every word
is PEACE. You are offered a wide range of boxes in a number of alphabet letters
different. Viewing the contents of the box, naturally you will ignore all the letters
except P, E, A and C. Other letters proverbial non essential amino acids.
Your purpose is 100 pieces for each letter P, A, and C, and 200 pieces for the letter
E. This is an essential amino acid that your body needs. If box # 1 has
100 pieces of each letter, then the "limiting amino acid" it is the letter E (for
You need 200 pieces). You can only produce 50 sign E PEA
this box, because the two E will be used to generate a single word. Because of you
need is 100 marks, then the "number of chemical" of this box is 50%. If box # 2
has 300 pieces of each letter of the alphabet except the letters which, for some reason, only
available 80 pieces, then the amount of chemical from this box is 80%. Letters will be
limiting amino acid.
So when foods like corn for example, found a number of chemical
by 72, this means that if you eat right in accordance with the overall number
protein the body needs entirely from corn, then one of the amino acid
(Which is limiting) will only exist in sufficient quantities to meet
72% of your need for protein. To meet the needs of all, what
you have to do is eat approximately 30% more than corn-corn.
The idea to complement proteins can be likened to buying two
box and combine their strengths to overcome the limitations of each.
Both boxes will produce an amount not only in the form 50 + 80 = 130,
but actually is 180. The overall yield larger quantities
compared with the amount of each. In fact, this works, but usually
not needed (as said by Frances Moore Lappe in this edition
continuation of the Diet for a Small Planet, the idea was popularized by the first edition) because
every single protein to produce adequate amounts of EAA to meet
needs of humans if eaten in sufficient quantities to complete the requirements
calories.
There are several facts that confound efforts to estimate the "quality" of food
protein properly. First, there is the parsing and development
continuous from body protein. Several EAA result from decomposition of body protein
can be used again to build other proteins. Second, when the calorie
consumed in quantities not sufficient for the purposes of energy in the body, acid
acids, including essential amino acids, were burned in large quantities for energy than
to rebuild body tissue. Things like this seem to food proteins
are in amounts less to do its work. This is why there are
belief that people are starving need a better source of protein.
Actually what they need is more calories. Now condition
thus more accurately described as "Protein-Calorie malnutrition" (PM) - deficiency
protein caused by a deficiency of calories. Third, the ability to digest well
is another matter. No matter how good of a number of chemical
protein, if the body is unable to decipher the protein into its constituent amino acids, this means
these proteins can not be used. There are several factors that affect
ability to digest protein. Heating food can be good or bad
by changing the composition of a protein secondary. Food weight in the form of meat,
for example meat, rarely completely digested in the digestive system
humans, then there are still large particles from the meat that came to
large intestine intact.
Fiber is the next factor. Remember that excessive fiber can
move foods that are digested rapidly into the small intestine where nutrient-
nutrients are not absorbed adequately. Protein is probably one of the nutrients
them. In small children, large amounts of fiber can cause
significant reduction in the number of amino acids absorbed. Raw foods
cut a good or a mixed (blended) can help reduce the impact
this.
Other measures of quality protein that you might read, with names like
Biological Value (BV) and Protein Efficiency Ratio (PER), which measures how much
protein foods that actually used by living things, is far more serious
in pembaurannya with these variables.
PROTEIN COMPLETE AND INCOMPLETE
One myth about vegetarian diet is protein content of "no
complete ", while animal foods believed to have" complete proteins ". Idea
of proteins from plants are not able to meet the needs of human nutrition is
old-fashioned thinking that based on research conducted on some of the rats
poor. Know that rodents such as rats have a need
proteins are much higher than we are as creatures feeding level
first. A very limited amount of protein from food difficult for them to
obtain adequate nutrition. It is often misunderstood is vegetable protein
contain one or more amino acids or less, while the amino acids of the protein
animal is often considered incomplete. In fact, all foods containing protein
overall amino acid. The exception is gelatin which is the animal protein
(Usually made from a horse's hoof, or beef). Gelatin is actually very poor
abortion will be one of the basic amino acid (tryptophan), this resulted in the number of
chemical nil. All protein foods have a number of chemicals above 30, usually
vegetable protein ranges between 55 and 85. While animal protein in the range 70
to 80.
So is something that does not make sense when people say that the vegetable protein
It is not complete. What is needed for all proteins (except gelatin) to satisfy
human needs is to eat them in sufficient numbers, so acid
limited basic amino can complement the need for protein in the human body.
It can always be achieved by eating a variety of vegetarian food without having to
calories consumed in excessive amounts. This is documented with an explanation
detailed in The McDougall Plan by John A. McDougall, M.D. (New Win Publishing, p.. 95 -
109).
DESCRIPTION OF VEGETARIAN CORNER
If the protein in food is not described in the small intestine (the only channel in
where amino acids are absorbed into the bloodstream), then this will be difficult for
lower digestive system, namely the large intestine. Things like this happen because
fiber push things too fast, this is actually not a problem because
The same fiber also encourage everyone out of the colon just as quickly. But
Thus, this can happen because the body is unable to describe the weight of animal protein,
bacteria in the colon tend to rot the rest of the protein molecules, especially
derived from meat, and the result of decomposition can be highly
carcinogenic. Eating fiber foods when eating meat is very helpful,
but it will not make the problem disappear.
SUMMARY
"Quality protein is a concept difficult to explain because it depends on the composition
chemistry of these proteins. It is also a function of how variables
provided food, what to eat in the same time, and the level of life
from someone who ate it. It's time we bury all of the trust
that vegetarian protein source that is incomplete. Many who have a number of chemical
higher than most animal protein, and for vegetable protein
with a lower amount of chemicals, they also have many functions. Contents
high fiber vegetarian diet can reduce the unprocessed
protein absorption capacity (especially for children who are still very small), but
This can easily be overcome by reducing fiber content gradually. Same
There is absolutely no reason to advocate animal protein in order to obtain content
enough protein.
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