FN
225:
Nutrition
Noy Rathakette, Ph.D. Health Professions Division Lane Community College Eugene, Oregon LECTURE 6A:
Protein
(Week 6) EXAM
3 next week (Week 7). Exams
are
always
due THURSDAY
and they will start being available on MONDAY.
If you need to take an exam late, please tell me BEFORE
the due date.
A commonly missed question
on Exam 2 was the one that asked "According to how we've defined it in
this class, what kind of food is white rice?" The choices were "whole",
"partitioned" or "refined". The answer was "partitioned."
Exam 2: The range of scores for Exam 2 will be posted above Week 1 around Monday and you can see your score in the class after Exam 2. Perhaps some of you still aren't accessing your Study Question results to see the correct answers, and looking at them could help improve your score on Exam 3. If you haven't been doing this, review what it says on page 26 of your packet.
LECTURE 6A:
Protein
First skim
through the Lecture Outline:
I
Introduction
II The Structure of Amino Acids & Protein III FUNCTIONS of Protein IV Protein in the Diet- Quality V Problems with Protein Quantity VI Digestion of Protein VII Using Amino Acids While you're waiting for the first Video Clip for this lecture to buffer, go to page 86 in your packet and fill in the figures below. We'll talk about those numbers later. Figures below are were downloaded in about 2005 from: http://globalis.gvu.unu.edu/ , an online interactive world atlas that is "a collaboration between the Norwegian UN Association, UNEP/GRID-Arendal, UNU/Global Virtual University, the University College of Hedmark and the INTIS schools. The project is supported by the Norwegian Ministry of Foreign Affairs and the Norwegian Agency for Development Cooperation." |
1960 | 1990 | 2002 | |
Afghanistan | 245 | 168 | 165 |
Malawi | 205 | 146 | 113 |
Haiti | 169 | 102 | 79 |
Iraq | 117
|
40 | 102 |
Cuba | 39 | 12 | 7 |
U.S. | 26 | 9 | 7 |
Sweden |
16 |
6 |
3 |
Other
countries with IMRs 3 or 2
as of 2005: Norway, Finland, Japan, Hong Kong, Iceland and Singapore,
who has the lowest IMR
|
Notes About CUBA: Since it's an example of an
communist country, Cuba's is an interesting statistic for Infant
Mortality Rate. Most Cuban
citizens live in poverty, with many factors contributing to this.
Some
feel one factor is the 70-year leadership of Fidel Castro.
Many others feel a factor is the United States Embargo Against Cuba, an economic, commercial, and financial embargo imposed on Cuba on February 7, 1962. In February, 2008, Fidel turned over power to his brother, Raúl. Eduardo Machado, a Cuban playwright living in the United States, says "My hope is that Cuba is allowed to become a part of the world again while keeping the social reforms that the revolution is so proud of: free education for all and free health care." Cuban
Exile
Ponders
Life After Castro, by Eduardo Machado, National
Public Radio, February 23, 2008.
Cuba limits
sales of food so all can eat, Associated
Press,
MSNBC, Oct. 10, 2008. "The lines are long and some foods are scarce,
but because the government has maintained and even increased rations in
some areas, Cubans who initially worried about getting enough to eat
now seem confident they won't go hungry despite the destruction of 30
percent of the island's crops by hurricanes Gustav and Ike last month."
Notes About IRAQ: Notice that is the most
recent date on the above table is 2002,
which was before the 2003 U.S. invasion of Iraq. In 1990,
the
United
Nations
Security Council passed a
comprehensive ban on trade with Iraq. A devastating bombing
campaign
against Iraq in 1991 destroyed the country's civilian infrastructure
(leading to contaminated drinking water, lack
of
electricity
for hospitals
As of March 2003 (just prior to the war), between 1.7 and 2 million Iraqi civilians have died due to malnutrition and disease, about 700,000 of them are children. Notice in the above table what happened to IMR in Iraq between 1990 and 2002. This over 12-year embargo on Iraq was lifted in 2003 by the United Nations. I have not been able to find a current IMR for Iraq. Please let me know if you know anything about the current IMR in Iraq. Now, go to the bottom of page 85 in your packet to the section about B. Protein Deficiency: Global Hunger Since the first cells to suffer from protein deficiency are those that are replaced most often, including red blood cells, plasma proteins as well as inner and outer skin cells, you would expect early symptoms to be problems affecting blood
Protein deficiency usually usually happens when
someone isn't
getting enough food, so that means they ALSO aren't getting enough
calories and they have something called PEM (it's also known as PCM).
There are two forms of PCM.the digestive tract since it's inner "skin" outer skin The
protein deficiency part is called kwashiorkor,
a
beautiful
word from Ghana in Africa that means "the evil
disease that strikes
the first
child when the second
child is born. In other words, weaning. It is
possible to
nurse 2 children, but it takes a well-nourished mother to do it.
When the child is weaned a mother who is very poor can probably manage just a thin cereal to feed her first child. The child may get barely enough calories, but not enough protein. That's the situation below for the child below who has kwashiorkor. Notice the edema (fluid buildup) at the ankles and wrists as well as the skin problems. I'll explain the edema in one of the Video Clips. On the right is the same child once protein was added to his diet. ![]() Sometimes
a person gets enough protein, but not enough calories. That
person has marasmus,
shown
below
with the girl with anorexia nervosa.
![]() The mother and child shown below have BOTH a deficiency of calories and a deficiency of protein, so they both have PCM (PEM). Notice the abdominal edema (called ascites) in the child. ![]() |
Now go back to page 83 in your packet and watch the
following two Video Clips to help with I Introduction II The Structure of Amino Acids & Protein III FUNCTIONS of Protein on page 83 and 84. |
Video
Clip: Amino Acids & Proteins approximately 11 minutes |
The two browsers that seem to be the fastest ways of
accessing the
video clips are Safari
on a Mac and Internet
Explorer on a Windows-based computer. If the movie just above isn't showing up on your computer and the movie just below isn't showing up on your computer, you may not have the latest version of QuickTime on your computer. Click here to download the newest version of Quick Time. |
This next Video Clip mentions denaturation,
which is
also discussed later, on page 86 where the definition of denaturation
is given. The Video Clip does not answer the question on page 83 at D. What the body uses to assemble the proteins it needs are amino acids. |
Video
Clip: Proteins approximately 16 minutes |
The above Video Clip doesn't
mention the following
parts of your Lecture Outline.
Additional functions of proteins include: 5. Antibodies. Antibodies
are proteins, so
a person needs protein in the diet in order to supply amino acids to
build antibodies. Antibodies fight infection.
6. Energy. We
usually use glucose & fat for energy before using protein.
The
important way the muscles
help provide energy for the brain is by having their amino
acids rearranged to become glucose
for the brain. Our brain
cannot
use fat
for energy, at least not in any significant amount.
The following is
an
emerging use for proteins that I want to learn more about.
Biomarkers:
'I'm Pretty Optimistic'; "...medical researchers are excited
about
the potential for diagnostic techniques involving proteins--workhorse
molecules that carry out myriad tasks required to
keep the human body functioning. Each disease may trigger its own
unique set of protein "biomarkers," which doctors might someday be able
to detect in simple blood tests." Newsweek, Dec. 11, 2006.
IV Protein in the Diet- Quality Measures of Protein Quality in a food include digestibility and how well the amino acid pattern of the protein supports growth. A. Digestibility. Animal protein is more digestible than plant protein. B. Amino Acid Pattern Take a
look at these 2 definitions in your Lecture Outline on page 84 of your
packet.
1. Complete
protein
This is a
protein in food
that has all the ESSENTIAL amino acids (in the needed proportions) for
building protein in the cells of the body. Food
sources for complete protein are listed on page 64 in your packet.
A
chicken puts protein in its eggs for the same reason we need to eat
protein- to provide amino acids to build proteins.
In other
words, the developing chick will get amino acids out of that yolk and
white, then uses those amino acids to build the proteins it needs for
muscles, bones, enzymes, hormones, etc.
2. Incomplete
protein This
is a protein in
food that is missing enough of one or more of the essential amino acids
needed for the building of protein in the body's cells.
Now look
at the
packet handout Food Sources Carbohydrates, Lipids, Proteins (page 64)
and refer
to it as you're watching the next Video Clip and filling
in
your Lecture Outline.
|
Video
Clip: Complete & Incomplete Proteins approximately 16 minutes This Video Clip will
help you answer the Study Question about why kidney beans have more
protein than green beans.
The two browsers that seem to be the fastest ways of accessing the video clips are Safari on a Mac and Internet Explorer on a Windows-based computer. If the movie isn't showing up on your computer, you may not have the latest version of QuickTime on your computer. Click here to download the newest version of Quick Time. Sometimes students have trouble opening the Video Clip below. If that's the case for you, please send me a message and I can suggest another way to get it. |
3. Mutual
Supplementation
Proteins-
2 incomplete
proteins that when combined form complete
protein (legume + grain)
A good example of Mutual Supplementation would be a bean burrito. The tortilla would be a grain source and the beans would be the legume. Another example of Mutual Supplementation would be split pea soup & cornbread, as split peas are legumes. Green
beans with a
dinner roll
would be a poor example of Mutual
Supplementation because the green beans haven't had much time to
manufacture protein the way a kidney bean would, as explained in a
previous Video Clip.
The oatmeal & milk would be a fine way to get protein, but they are NOT an example of Mutual Supplementation because the milk has complete protein and Mutual Supplementation involves 2 incomplete proteins. V Problems with Protein Quantity (as opposed to the last section which looked at Protein Quality) A.
Problems
with high
protein levels in your
diet:
1.
Amine group (the N part) of extra amino acids:
Below is
aspartic acid, an amino acid we looked at earlier when we said all
amino acids have 4 parts. One part is the amine group
and the other 3 parts have carbon (1- Central C
& H, 2-acid groups (COOH)
& 3- side
chains). First the amine group.
![]() Aspartic Acid The
amine group (NH2) is pulled off by the liver
& excreted by the kidney, which can be hard on he
liver and kidney.
2. Central C & H, acid groups (COOH) & side chains (mostly C, H, O) are used for energy if you need it OR if the calories are extra, it is changed into fat. 3. High protein diets may accelerate adult bone loss by causing calcium loss. |