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By Nancy
Appleton, Ph.D.
In 1912, a Frenchman by the
name of Louis Maillard found out that the reason that some foods discolored
and toughened when they were cooked was due to a chemical attachment of the
sugar (glucose) in the food to protein.
The Maillard
Reaction
This reaction causes toast to
turn brown and steak to toughen during cooking. It takes a high temperature
to bind these glucose and protein molecules. He found out that this
attachment changed the structure of the protein, and it could be a problem
for this new structured food to digest, assimilate and metabolize in the
body.
Besides barbecuing and frying,
most processed foods are heated to high temperatures, and the Maillard
Reaction is a problem for any food heated to a high temperature. Since 1912,
more research has come out on the Maillard Reaction, or the browning
reaction, because cancer has been linked with this process.
Food scientists are continually
trying to find a method to slow or stop this reaction in processed food. To
me, it seems better to not eat foods that are processed using high
temperatures rather than looking for a magic potion to stop the reaction,
which might cause its own problems, or looking for a pill to give someone
who has eaten over- processed foods to stop the reaction, which again might
have its own side effects.
Recently, new research has
shown that this same reaction, of sugar binding with protein in an abnormal
way, can go on in the body when our blood glucose becomes, and stays,
elevated.
In 2002, the consumption of
sugar is approximately 170 pounds per person per year in the United States.
This glut of sugar can cause some to have elevated blood glucose -- much
more elevated than in the past when we ate less sugar. When our blood and
our blood cells become awash with this sugar continually, the sugar can
become bound nonenzymatically with protein.
That might not sound so harmful
but it is. There is a normal process where sugar binds enzymatically to
protein in our body and forms glycoproteins that are essential to the
working of our body. All of these chemical reactions in living tissues are
under strict enzymatic control and conform to a tightly regulated metabolic
program. When enzymes attach glucose to proteins, they do so at a specific
site, on a specific molecule, for a specific purpose.
Sugar and protein are not
supposed to bind nonenzymatically. When they do, the product that is formed
is called glycated protein or Advanced Glycated End Product (AGE). This
process can permanently alter the molecular structure of the protein and, as
a result, alter the way these AGE function in the body. The protein becomes
toxic to the body.
Toxicity causes cells to not
function optimally, causes damage to the body, and results in an exhausted
immune system. Degeneration takes place over time. These changes can start
as minor disturbances or disabilities and later continue on to become
specific illnesses.
This damage to the proteins
takes place in two stages. The first product that is formed by glucose
attacking the protein is called a Schiff's base, which stays in the body for
a few days. The Schiff's base is unstable and will undergo a slow chemical
rearrangement that will last several weeks until it forms a more stable
union, the Amadori products.
These products have more
reactions until they form AGE, which irreversible. AGE are characterized as
brown or fluorescent pigments and seem to promote many age related
complications, such as atherosclerosis, hypertension, cataracts, macular
degeneration, joint stiffness, rheumatoid arthritis, Alzheimer’s disease and
diabetes.
Glycation of blood proteins
takes place when the levels of glucose shoot up and stay high. Anyone who
drinks just one soft drink, eats a candy bar or a donut on an empty stomach
will find that the levels of glucose in their blood shoot up. The average
person living in the United States today drinks over 576 12-ounce servings
of soft drinks per year, or 1.6 12-ounce cans per day. The average teenaged
boy drinks 868 soft drinks per year.
Each soft drink has 10
teaspoons of sugar, so each person is getting about one-quarter cup of sugar
each day from soft drinks alone. The average person consumes over one-half
cup of total sugar a day. This excess can make the blood awash with sugar
much of the time, leading to ramifications such as the immune system being
suppressed.
A recent study presented at the
annual meeting of the Diabetes Association in San Francisco shows that
eating browned foods may cause heart attacks, strokes and nerve damage.
Scientists have known for many
years that cooking proteins with sugars in the absence of water forms AGEs
that can damage tissues in the body. Diabetics suffer a very high incidence
of nerve, artery and kidney damage because high blood sugar levels in their
bodies markedly accelerate the chemical reactions that form advanced
glycation products.
The frightening news is that
eating foods with these AGE raises blood and tissue levels and increases
nerve damage. Cooking with water prevents sugars from binding to proteins to
form these poisonous chemicals.
Cooking without water causes
sugars to combine with proteins to form AGE. So, baking, roasting and
broiling cause the poisonous advanced glycation products to form, while
boiling and steaming prevent them. According to these new findings, brown
foods, such as brown cookies, brown bread crust, brown basted meats, brown
beans, and even brown coffee beans may increase nerve damage, particularly
in diabetics who are unusually susceptible to nerve damage.
On the other hand, since
steamed and boiled vegetables, whole grains, beans and fruits are made with
water, they do not contain significant amounts of advanced glycation
products. This is certainly another reason to remove as much sugar from your
diet as possible, as soon as possible, and eat much of your food raw or
steamed.
Nancy Appleton is the author of
Lick the Sugar Habit,
Lick the Sugar Habit Sugar Counter,
The Curse of Louis Pasteur,
Heal Yourself with Natural Foods, and
Healthy Bones.
Her Web site is:
www.nancyappleton.com
Many thanks to Nancy for the
sugar update. She has written the classic book
Lick the Sugar Habit as well as a number of articles for this site,
which are listed below.
One of my passions is
Metabolic Typing, which identifies your individual biochemical and
genetic requirements. One thing is clear regardless of your metabolic
type-sugar is not good for you.
One of my other passions is
seeking to consume as much raw food as possible. Consuming raw foods tends
to limit many of the problems with AGE-related proteins discussed above.
We also have the modern day
exposure to
acrylamide, a chemical listed as a probable carcinogen, which is thought
to be formed by the heating of starches. It has been in the news lately and
will provide increasing evidence of the harm of cooking many foods.
Some light at the end of the
tunnel: sugar is not bad for everyone at all times. If you are healthy and
of normal body weight, it appears that raw honey, used in moderation, is an
acceptable sweetener.
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