Understanding poisons from a creationist perspective
by Jerry Bergman
The problem of poisons is considered, and it is concluded that a false dichotomy
exists between poisonous and non-poisonous chemicals. Nothing is toxic in small
amounts, and all chemicals are toxic at high levels. Further, virtually all chemicals,
even poisons and toxins, have an important function in life or human society. Because
compounds can be used in a harmful way does not negate their importance when used
appropriately. Fire serves us well by heating our homes, cooking our food and sterilising
medical equipment, yet fire has caused the loss of an enormous number of lives.
Likewise, many major poisons and toxins are shown to play critically important beneficial
roles in society. It is not the compound that is the problem, but the use to which
it is put. Actually, life could not exist without some compounds that are toxic
to some life-forms. Conversely, our body has a complex means of protecting itself
from toxins which renders virtually all toxins harmless in the amounts to which
most of us are exposed.
Introduction
Toxins are poisons produced by plants, animals and bacteria or found naturally in
the air, water and soil. A poison is any substance that produces injury to the body
by chemical means. Some are corrosives that destroy tissue directly; others are
irritants that inflame mucous membranes. The two terms ‘toxins’ and
‘poisons’ are largely synonymous and are used here interchangeably.
The term poison tends to be the lay term, while toxin is the scientific term.
The subject of poisons is burdened with many misconceptions and is far more complex
than assumed just a few years ago. When reading about mercury or lead poisoning,
or murders in which someone used a deadly poison such as arsenic, some may ask,
‘Why would God create chemicals that cause so much harm to people?’
Atheists commonly argue that a loving God would not make deadly chemicals which
have killed millions of people. Young concludes that germs and poisons are:
Perfectly understandable in terms of evolution [but] make no sense whatever
in terms of design by an infinitely intelligent, wise, and compassionate Creator’.1
Actually, evolution—specifically natural selection—can ‘explain’
either situation. If no poisons existed natural selection could explain this situation
by explaining that poisons ‘selected’ to extinction those animals that
had less defence against them. In fact, poisons that the body cannot easily handle
occur relatively rarely in nature. Levy and Primack note:
While there are some 7,000 plants and fungi that produce or contain toxic
substances, only a few are really very dangerous. According to the Food and Drug
Administration’s National Clearing House for Poison Control Centers, there
were only 7,710 cases of exposure to plant poisons recorded in 1975. Of these victims,
1,990 reported symptoms, 186 were hospitalized and 3 died … most plant poisonings
are relatively mild and your overt overreaction can amplify the symptoms …’
2
A major reason for toxins in this post-Fall world is to maintain the ecological
balance so necessary for life to exist on the Earth. An example is penicillin, a
toxin to bacteria but harmless to humans, which has saved millions of lives. Most
plants produce toxins to protect themselves from pathogens. Further, bacteria are
necessary for life because they serve as recyclers of organic materials. Without
them, all of the organic nutrients would eventually become locked-up in non-bioavailable
forms and eventually life would become extinct on Earth. The only concern is to
prevent recycling until the animal is dead. This is the function of the animal’s
defence system, which includes the use of toxins.
The terms ‘poison’, ‘toxic’, ‘pesticide’ and
‘herbicide’ all imply that because some chemicals may function as toxins
in some situations, they are therefore always detrimental to humans. The implied
dichotomy between the words ‘toxic’ and ‘non-toxic’ is wholly
artificial and impedes understanding the toxicity problem.3
Chemicals are not toxic or poisonous, only amounts are; no chemical
is toxic at low levels, and all chemicals are toxic in large amounts.4 In Stevens’ words, ‘Anything in a large
enough dose can prove toxic’.5
Even water is toxic if certain amounts are ingested and can cause a coma or death
if ingested in high levels during a short time period.6
Such water intoxication is actually an excellent example of the fact that all substances
are toxic in large amounts. Tisdale describes the result of water toxication:–
The volume of water both inside and outside the cells increases, but the
salt does not, and brain cells swell, then shrink … . Water intoxication
can occur accidentally, especially in the medical treatment of a dehydrated person.
But it happens most frequently among schizophrenics … schizophrenics sometimes
have a compulsive need to drink water.’7
And a Food and Drug Administration report stated they receive many reports of hospitalisations
involving
water intoxication of young infants. Preliminary reports indicate that three
infants were admitted to the hospital with seizures and hyponatremia apparently
associated with relatively large intakes of free water. The other two infants were
reported to have low blood sodium levels on admission that were believed to be related
to water ingestion.’8
Oxygen is also necessary for life, but, as every nurse knows, excess amounts are
lethal and lower excesses have been a major cause of blindness in premature babies.
Oxygen toxicity develops when the p(O2) rises above 2.5 atm. (36.8 psi).
The result is oxidation of certain enzymes, which damages the central nervous system
and causes coma, and eventually death. A major problem in abiogenesis is how early
life survived an oxygen environment, and for this reason evolutionists must postulate
that a non-oxygen atmosphere existed at this time, that is, a reducing atmosphere
(for the evidence against the reducing atmosphere hypothesis, see Thaxton et al.9).
Many poisons have critical uses in certain areas of life and society.10 A poison is merely an excess
amount of a chemical in the wrong place at the wrong time. Low
amounts of many ‘poisons’ in the right cells are actually necessary
for life, and all vitamins and minerals are toxic above certain levels. Vitamins
A and E are critical for life but highly toxic if taken in high
dosages. The standard vitamin-mineral reference lists toxicity data for all vitamins,
minerals and food supplements.11
Thalidomide: Curse or Miracle Cure?
The drug thalidomide became infamous for causing a large number of birth defects,
primarily if taken at a certain time during pregnancy. Actually, only one of its
enantiomers was a teratogenic agent which caused children to be born with missing
or misshapen limbs.12,13 Although the image of this drug has caused researchers
to avoid exploring its many potential uses, recent studies have found that it is
among the most effective treatments known for leprosy and can also improve enormously
the survival rate of patients who receive bone-marrow transplants.
Thalidomide has also been successfully used to treat other potentially fatal disorders,
including aplastic anaemia and certain kinds of bone cancers. Aplastic
anaemia is a deficiency in the quality or quantity of the erythrocytes caused by
aplasia, a failure of a red blood-cell-producing organ to develop.
Specifically, the bone marrow—where most blood cells are produced—fails
to develop or becomes diseased. Thalidomide also reduces the graft-versus-host
disease problem by moderating the voracity with which the grafted foreign
tissue attempts to reject its new home. Nor is thalidomide the only toxin that is
a miracle drug. In one listing of plant poisons, their use for medicine is obvious:
The development of blatantly poisonous compounds by plants and fungi is extraordinary
in the variety of toxins that they produce. These compounds are chemically very
diverse and include powerful substances that affect heart muscle and blood pressure,
smooth muscle relaxants, cyanides that block cell respiration, cell poisons that
inhibit protein synthesis, hormone-like compounds, hallucinogenic chemicals, irritants,
blistering agents, photosensitizers and plant allergens. Some act rapidly, causing
instant irritation, nausea, vomiting and diarrhoea, while others are more insidious,
producing deadly delayed reactions. While the development of these potent and sophisticated
chemical defenses has helped plants and fungi avoid being eaten, these poisons have
also caused deaths, pain, itching and a variety of ills to people who have either
eaten or come in contact with them.’14
All of these classes of poisons have become the miracles of twentieth century medicine,
and more are being discovered all the time. Actually, the wonders of modern medicine
are primarily due to the discovery of drugs which can cure or help
persons survive what were once fatal diseases.
Toxins can also be critical for survival for other reasons. One example is the Pink
Pigeon which lives on the island of Mauritius in the Indian Ocean, the island famous
for being the home of the now extinct Dodo. The Pink Pigeon may be alive today only
because of a mechanism called aposematism. This mechanism uses
chemicals as warning signals and for protection. In this case, humans or animals
who dine on the Pink Pigeon become extremely ill. Animals soon learn this and avoid
the bird.
Interestingly, the source of the birds‘ toxic chemicals is evidently from
a fruit—the pigeons commonly dine on this fruit and accumulate the toxin without
ill effects, but it poisons those animals who eat them.15
Also, animals that defend themselves by toxins often use conspicuous colouration
to easily differentiate themselves from other animals. This allows their predators
to easily identify them and to avoid them.
Since high energy levels and low weight are critical for birds, obtaining the toxin
from food rather than manufacturing it from scratch eliminates the need for them
to use their own energy to manufacture the toxin themselves. Rarely do these toxins
kill the predator; most often they make predators sick enough so that they avoid
the animal which causes the problem. These mechanisms are critical
to help maintain the balance of nature which is necessary for life to survive in
the post-Fall world.
The Botulinum Toxin
The most poisonous substance known to mankind is botulin, a neurotoxin produced
by the single-celled bacterium Clostridium botulinum.16 The bacterium that causes it is an extremely common
soil and water bacteria spore. The proper conditions cause the spore to develop
into the rod-shaped bacterium Clostridium botulinum. Botulin is ‘six
million times more toxic than rattle-snake venom’,and a lethal dose
for humans is a mere 1/10,000th of a milligram.17
Botulin poisoning usually results from eating improperly canned or contaminated
food, and produces muscle paralysis.18
The toxin firmly attaches itself to nerve endings and permanently blocks neurotransmitters—chemicals
which allow the nerve impulse to travel from one nerve to another at the synapse
junction. Binding to nerve endings prevents the release of the neurotransmitter
acetylcholine. Similar to jamming a light switch permanently so it cannot be turned
on, botulin blocks the nerves, preventing the brain’s signals from reaching
a muscle. If enough nerves are blocked, the muscle becomes severely weakened or
paralysed. Death occurs because the chest muscles cannot perform their breathing
function, producing suffocation.
Yet, this most dreaded of all toxins is a miracle drug for those suffering from
dystonias and other health problems. Dystonias produce involuntary
muscle spasms which cause the eyelids to blink or clamp shut, the neck to twist
into painful contortions, the fingers to cramp, and vocal cords to freeze.19 The dystonias in general result from excess
nerve signals to the muscles, causing them to overreact. This uncontrolled muscle
spasm can result from both voluntary and involuntary production of excessive electrical
brain impulses.
Botulin treatment is also highly effective in about 85 per cent of patients with
the cross-eye condition named strabismus. This malady is usually
outgrown by about age six months, but if it persists surgery was often the only
alternative until the development of botulin treatment. Strabismus is caused by
an over-active eye muscle on one side and a weak muscle on the other. The brain
processes light information picked up by the retina by combining both the left and
right signals. If the weak eye is too far out of alignment with the dominant one,
the brain relies solely upon the stronger eye signals. If this continues for too
long, the brain becomes unable to interpret images from the weaker eye, thus lets
it drift—a condition called amblyopia or lazy eye. As a result,
the person can use only one eye and consequently has little depth of field and experiences
major difficulty in judging distances. Amblyopia also carries considerable social
stigma and often results in major psychological and social adjustment problems.
The surgical treatment involves cutting away a portion of the hyperactive muscle
to weaken it and allow the other eye to line up properly. The new treatment uses
precisely targeted injections of botulin to inactivate the spastic or hyperactive
muscle. This technique in most cases restores normal control to the patient without
the need for invasive surgery. Botulin weakens the spastic or over-developed eye
muscles in the same way that it weakens the muscle pull of persons suffering from
botulism toxin. Unfortunately, the results are not permanent new nerve endings eventually
replace those blocked by the drug. Nonetheless, it is now the most effective treatment
for amblyopia and is regarded as an established medical procedure.
Botulin therapy is a major breakthrough for blepharospasm, an uncontrollable
eye blinking that sometimes involves other facial, throat and neck muscles. It is
also effective for both chronic writer’s and musician’s cramps—an
especially severe problem for students and persons whose work involves much writing
or the use of fingers such as musicians, especially violinists and pianists. Botulin
also holds enormous promise for millions of Americans in helping to control spasticity
and tics due to cerebral palsy or other causes.20,21,22,23
Success has also been achieved with severe stuttering by injecting the toxin into
the vocal cords to provide potential relief for millions of sufferers. It is also
effective for spasmodic dysphonia, a muscle spasm which affects
the pharynx and results in an extremely strained voice.24
The treatment involves injection of botulin into the thyroarytenoid muscles that
control the vocal cords. Additionally, one of the most useful areas for botulin
is the treatment of spasmodic torticollis, an extremely painful,
debilitating neck spasm which causes the head to thrust about uncontrollably.25
Other uses include treatment of laryngeal dystonia (larynx muscle
spasms which cause speech difficulties), and temporomandibular dystonia
(involuntary movements of the jaw, lower facial, and tongue muscles). It is even
helpful for tremors such as hemifacial spasm, an involuntary twitching
or contraction of the muscles on one side of the face.26
The dystonia family of diseases affects about 390 people per million population.
Before the botulin treatment, few effective methods existed to help the large number
of people afflicted with these problems. One study found the botulin treatment success
rate was 85 per cent in a long term follow-up.27
Many persons assumed that these diseases were psychosomatic, and the discovery that
they are not has both relieved sufferers and helped to reassure physicians that
these patients are treatable.
Botulin is an extremely complex molecule—its molecular weight is a whopping
80 times that of insulin. Its large number of atoms must be assembled with the precision
of a fine watch. Its commercial and laboratory production, primarily directed by
Ed Schantz, is a complex speciality which still is more art than science. Schantz
has spent almost a half century researching methods of effectively extracting the
pure toxin from the bacteria. His lifetime experience was required to achieve the
skill needed to isolate it effectively from the bacteria for therapy use. Because
it is so toxic, a lethal dose is usually only about one-ten thousandth of a milligram.28
Ironically, the usefulness of botulin to the bacterium itself is not yet known.
It is an anaerobic organism, once a major problem when home canning was common and
food preservation techniques were less developed than today. Although one occasionally
reads about cases, it is rare today because commercial canners must by law heat
their products up to temperatures and pressures high enough to kill not just the
bacterium, but also the botulism spores. Unfortunately this high heat-pressure level
also destroys many of the food’s vitamins.
Arsenic—A Poison and a Vital Mineral
Probably the most famous of all poisons, arsenic, is actually a vital mineral for
many animal metabolic systems. It is commonly used as an insecticide or rodenticide,
and most arsenic-based pest control products contain copper acetoarsenate, or calcium
or lead arsenate.29 Arsenic compounds
cause death by interfering with the body’s energy-producing processes in the
cell mitochondria. The specific mechanism of arsenic poisoning is usually its inhibition
of pyruvate dehydrogenase, the enzyme that breaks pyruvates down in the mitochondria
so they can be processed for energy production. Arsenic also decreases glucose storage
and inhibits glucose production.30
It is also carcinogenic and teratogenic.
Conversely, as Lederer and Fersterheim31
note, the research data indicate that ‘arsenic is an essential element for
several animal species including humans’. One vital role that arsenic
plays in many animals is as an enzyme component to metabolise protein and certain
amino acids, including arginine and methionine. Human adults need ‘about 12
to 25 micrograms’ per day.32
The most common methods of measuring body arsenic levels are analyses of urine,
hair and fingernail samples.33 Normal
persons have an average concentration of 0.005 mg of arsenic per hundred grams of
hair, and excrete between 0.01 and 0.06 mg arsenic per litre of urine. Arsenic is
also a vital element in the electronics industry, and is needed for preparing tissue
for transmission microscopic work.
Other Toxins Now Known to be Essential Minerals
Whitney et al.34 summarise
some of the evidence that indicates many other well-known toxins, including lead,
mercury, barium, silver and cadmium, all play key roles in nutrition and health.
Barium, a poison rated ‘5’ on a scale of 1–6 (thus extremely toxic),
which even in low levels can severely irritate the eyes, nose, throat and skin,
is vital for proper growth and may protect the body from ulcers. Slightly greater
levels of it cause cardiac irregularities, convulsions, and death from cardiac and
respiratory failure.35
Other highly toxic vital minerals include iodine (also a toxicity rating of 5) which
is required for thyroid hormone synthesis. Copper is needed for normal blood-cell
formation and has a major role in the production of several enzymes involved in
respiration, central nervous system functioning and connective-tissue formation.36 Vanadium is required for bone
development and normal reproduction; cobalt is an essential part of vitamin B12;
silicon is involved in bone calcification; and nickel is critical for certain enzymes
to work and evidently also for iron metabolism.37
The Miracle Element Selenium
Many other trace minerals necessary for proper health are also toxic in relatively
low amounts.38 Selenium is extremely
poisonous (toxic at 0.2 mg/m3) and, if inhaled in sufficient amounts,
causes nervous system disorders, tooth damage and Lou Gehrig’s disease. It
is also an essential element needed as a co-factor for the enzymes that function
as antioxidants. These compounds reduce the amount of polyunsaturated acid oxidation,
now considered by many researchers to be a major cause of arteriosclerosis.39 Selenium’s role as an antioxidant is also
complementary to that of vitamin E, and neither can replace the other. The recommended
intake for adults is 0.05 to 0.2 mg daily.40
Selenium also may have a protective effect against certain cancers, although its
most important biological function is probably part of the enzyme glutathione
peroxidase. This compound helps to minimise a cellular structure damage
problem called peroxidation which, regardless of whether it occurs
naturally or is chemically induced, can lead to cancer. The glutathione peroxidase
enzyme destroys oxidative compounds that would otherwise oxidise chemicals in the
cell, consequently destroying some organelles and eventually the cell. Selenium
is also probably extremely important in bolstering the body’s immune system,
and its ability to reduce the incidence of cancer may be so dramatic that some researchers
recommend daily supplements for the general population.
One past outbreak of heart disease involving hundreds of thousands of children and
young women in large areas of western China in the 1970s was due partly to selenium
deficiency. Correction of this diet deficiency has now largely eliminated the problem
called Keshan disease.41
The cause of the deficiency was the low levels of selenium in the soil in those
areas, a situation that also correlates with certain kinds of cancer. Most Westerners
are largely protected from severe selenium deficiencies because their food is generally
obtained from a wide variety of areas around the country.42
Also, meat and animal products which are good selenium sources are a major part
of the Western diet.
Chromium—Another Miracle Metal
Chromium causes cancer, corrodes skin and nasal membranes, and can damage the kidneys
and the body’s immune response system (toxic at 0.1 mg/m3 or less).
Conversely, it has now been proven to be an essential trace element.43 Studies of patients for whom prolonged intravenous
feeding was the sole source of nutrition have vividly demonstrated the importance
of chromium for normal glucose metabolism. It interacts with insulin to aid the
entry of glucose into the cell at the cell membrane entry port, and consequently
it controls the energy supply for cell use. When chromium is lacking, insulin effectiveness
is also impaired.
Because chromium tissue concentration typically declines with advancing age, and
its deficiency may be a major cause of the development of adult-onset diabetes,
many nutritionists recommend regular use of chromium supplements. Studies of diets
which include chromium supplements have found that the element can help control
blood pressure, increase stamina and build muscle.44
Chromium also plays a critical role in carbohydrate and lipid (fat) metabolism.
Chromium supplements can help to correct glucose imbalances by lowering high blood
glucose concentration in diabetics, raising low blood glucose concentrations as
found in hypoglycaemia patients. Because chromium deficiency can also raise serum
cholesterol and LDL concentration and lower HDL concentration, chromium supplements
can help to prevent coronary artery disease. Unfortunately, the more
refined the food, typically the less chromium it contains. Some
researchers estimate that a high proportion of the population does not ingest enough
dietary chromium for this reason. Fisher concludes that up to 90 % of Westerners
do not take in enough of this vital nutrient.45
Chromium is unusually high in vegetable oils, brewer’s yeast, whole grains,
nuts, egg yolks, meats, and certain kinds of cheeses but is often poorly absorbed;
thus supplements are often recommended. Chromium absorption levels depend upon the
ion ingested, and the Cr3+ ion seems to be the form best absorbed and
is most effective in living systems. The dietary supplement that is evidently most
bioavailable is chromium picolinate. The body also has a natural
protective mechanism to prevent over absorption by causing absorption
to increase with low dietary intake and decrease
with high dietary intake.
Vitamins—Too Much of a Good Thing?
Almost every school child knows that vitamins are necessary for good health. Unfortunately
though, many people believe that because small amounts of all vitamins are essential,
larger amounts are better and megadoses are better yet. This belief may be one reason
vitamin overdose is now a major problem. Called hypervitaminosis,
the most common symptoms include nausea, diarrhoea, rashes, fatigue, and eventually
death. Especially of concern are the fat soluble vitamins (A, D, E and K), and the
most common overdose problem is vitamin A.46
Although necessary in moderate amounts for the maintenance of skin, hair and mucous
membranes, as well as vision and bone and tooth growth, high vitamin A intake can
cause serious health problems and occasionally death. Many health experts recommend
for this reason that supplementary vitamins should be taken only
under the advice of a physician.
The Natural Versus Synthetic Debate
Much of the concern over toxicity relates to the labels synthetic
versus natural, a chemical division that is artificial and often
meaningless. The common assumption that compounds made by nature are good and those
made by humans are bad (or at least have a far greater chance of being damaging)
is erroneous. Although legal definitions have been attempted, most synthetic
chemicals are nothing more than modified, and sometimes not greatly so,
natural chemicals. Many are identical to the natural, but are able to be produced
more simply and cheaply outside of a plant or animal. Each chemical also has to
be evaluated separately for toxicity concerns regardless of its
source. Because this is true for all of the ten million chemical substances listed
in the 1997 Chemical Abstracts, scientists have much work ahead of them.
Many persons tend to think of natural compounds as non-poisonous and human-made
ones as more likely to be harmful. This generalisation is not valid; all plants,
including those used by us for food, produce their own specific natural compounds
which were designed to be toxic as a means of protection against pests, including
insects, fungi, and animals.47 Eating
a balanced diet consisting of small amounts of a wide variety of foods is generally
safe. Since all foods contain toxins, the only concern should be the level
to which we are exposed of each type of compound and whether our
liver can adequately detoxify the level of the compound ingested. This organ is
marvellously efficient at rendering excess amounts of potentially lethal compounds
harmless. Our body, if healthy and not overburdened, is actually extremely effective
in rendering normally-encountered levels of most toxins inert.
We should also be very cautious, but not paranoid, about utilising chemicals which
have not yet been adequately tested. Many chemicals exist which we know are extremely
toxic to humans, and yet many people do not seem very concerned about them.48 An example is the finding that hundreds of the
over 4,000 chemicals commonly found in cigarette smoke are extremely toxic to humans.
One, radioactive polonium-210 (half-life = 138.4 days), is one of the most toxic
substances known to mankind, and yet many people tend to worry more about Aspartame®
which has a toxicity of something like a millionth of polonium-210.49 This information could also mean saving lives
if applied to reducing toxins in one’s environment.
How Our Body Protects Us Against Excess Toxins
The average person today probably is exposed to 360 millirems of radiation annually
from cosmic and terrestrial sources alone. The major cosmic source is from galactic
and extragalactic locations, and the primarily terrestrial source is from radon
gas and smoking.50 Researchers have
discerned that a phenomenon called hormesis exists to protect us
against toxins and poisons. Hormesis primarily involves the toxin stimulating the
development of the body’s defences against that toxin, producing antitoxins.
Thus, small amounts of many toxins including radiation may be a necessary
requirement to keep the body’s immune and defence systems healthy. Arsenic,
copper and selenium all play an important role in metabolism—and they also
may trigger the body’s defences against excess amounts.
One research study which supported this conclusion was completed by Bernard Cohen
of the University of Pittsburgh. He found that up to several hundred millirems of
radiation produced no discernible negative effect on health. Beyond this though,
he found a slight but significant decrease in radiation-induced
carcinomas. These data were unexpected because it has been assumed, in harmony with
Nuclear Regulatory Commission policy, that a zero level radiation threshold exists
and that the damage rises linearly until it reaches the lethal dose level.
Cohen found that the downward trend does reverse itself, but only
after it rises above a base line of about 5 rems a year, about
50 times greater than the Nuclear Regulatory Commission’s annual recommended
limit. Evidently, exposure does not cause problems until about 100 rems a year is
reached. This finding was supported by the research on Hiroshima and Nagasaki’s
80,000 survivors, who were divided into control and radiation-exposed groups. The
control group, about half of the subjects, experienced normal background radiation.
The experimental group experienced significantly higher levels. About 120 incidences
of carcinoma were found in the control group, a discovery which
ran 180 degrees counter to the then current conventional wisdom.51
Studies of people living in high elevations who are exposed to more cosmic sources
of radiation and those who live in high radon areas, as well as people who have
cardiac pacemakers which use plutonium power, also confirmed that radiation exposures
up to a certain level seemed to be beneficial. A possible conclusion
is that these medium levels of toxins stimulate the body’s defence system,
significantly benefiting the person.
Detoxifying Compounds
An estimated 10 million organic compounds are known to exist naturally or have been
created by the labs of the world’s scientists. The body does not have enough
genes to respond in a unique way to detoxify each one of these 10 million or more
compounds that exist. The body deals with this problem in a special way described
below.
Compounds that are not made by the body, including pesticides, environmental pollutants,
carcinogens and drugs, as well as harmless compounds, are all called xenobiotics.
The term means a chemical compound that is foreign to the body (xeno is
Greek for stranger). Xenobiotics typically are dealt with by a two-pronged attack.
The first step is to cause a chemical reaction which makes them more hydrophilic
and water soluble to prevent their accumulation in fatty tissues. The second step
involves enzymes that modify the xenobiotic structure to cause it to be even more
water soluble, and consequently more likely to be excreted.52
To make xenobiotics more hydrophilic, a hydrogen atom is replaced by hydroxylation
reaction which is caused by a monooxygenase enzyme complex, specifically cytochrome
P-450. Cytochrome P-450 is a member of the large cytochrome family,
which is famous in the electron transport system for tweaking all the energy possible
out of food at the end of the Krebs cycle. The ‘P-450’ designation refers
to its light-absorption level, a measure used to classify compounds. This compound
absorbs light most strongly at the 450 nanometre wavelength.
The second phase of xenobiotic metabolism involves bonding through either an oxygen,
nitrogen, or a sulphur atom to a more highly polar group, often the glucose derivative
glucuronic acid or the amino acid derivative glutathione.
About half of all drugs are metabolised by cytochrome P-450, primarily in the liver
as the drugs pass through on their way into general circulation. Consequently, drugs
need to be taken in a steady dose. In this way the physician can control the amount
in the body. Lowering doses rapidly lowers the blood level of the drug; conversely,
increasing doses rapidly increases the blood level. If the drugs were not rapidly
broken down, the body could only very slowly reduce the blood level of a drug, and
one would have far less control of a drug’s level at any one time. This is
critical: drugs which are harmful are rapidly broken down by the body if taken in
an overdose, reducing the likelihood of long-term damage. Phenobarbital, for example,
a drug commonly taken to commit suicide, is rapidly hydroxylated by cytochrome P-450;
then it is dissolved in the blood and excreted. For this reason large amounts must
be ingested in order to be lethal.
Although the cytochrome P-450 molecule effectively detoxifies many poisons, it can
convert some compounds into carcinogens. These converted compounds
may damage DNA, causing cancer or other problems. The best example is polycyclic
aromatic hydrocarbons (PAHs) produced by incomplete burning and found
in most smoke, especially cigarette smoke (and in some meteorites). (Complete burning,
that is, with enough oxygen, does not produce polycyclic hydrocarbons.) These compounds
are broken down in the body into compounds which cause serious problems. Although
exposure to combustion by-products as smoke is not rare, it generally does not cause
a problem because the cough reflex is triggered if the environmental smoke level
is excessive. Unfortunately, this cough effect can in some cases be overcome, such
as in the case of certain kinds of so-called mild tobacco smoke.
The origin of this ‘mild tobacco smoke strain’ that does not as effectively
trigger the cough reflex, thus bypassing this important defence mechanism, was a
mutation. Therefore, when a person is smoking tobacco, this important protection
is often not triggered. Consequently, in the United States alone over half a million
people die annually from tobacco smoke, and it is estimated that of those alive
today, smoking will take almost a billion lives throughout the world.
Cytochrome P-450 is an inducible biomolecule, meaning that if more
is needed, more is made by the body. Not unexpectedly, smokers have more cytochrome
P-450 than non-smokers.53 The body’s
response to carcinogens varies with genetic makeup, previous exposure, and total
exposure. Even if one has a genetic weakness which allows dangerous compounds to
have a greater deleterious effect, avoiding exposure will reduce this problem. Actually,
the people most at risk for poisoning today in the Western world are smokers, certain
industrial workers and the following persons:
Ever-increasing numbers of people are gathering wild plants in search of
new gastronomic natural treats, bringing into jeopardy another segment of the population.
Some of these wild harvests involve misidentified plants and can cause a most unhappy
or even deadly experience. The number of people practicing herbal medicine (a tradition
that goes back to before the time of Christ) is also on the rise. People seeking
natural products (roots, leaves, and bark) to make their concoctions and potions
can err and experience mild to severe poisoning. Another group …
[using] wild plants, sometimes at considerable risk to themselves, are those people
looking for a natural high from smoking or eating plants which contain hallucinogens,
although the greatest risk here comes when such a person stumbles across a hidden
marijuana plot guarded by a trigger-happy protector of his crop. There have been
several deaths due to such accidental encounters.’54
In a perfect world these mechanisms would be fully adequate to prevent toxins from
causing problems to humans. In the fallen world, mutations in plants and animals
plus destructive behaviour on the part of humans offsets this balance, causing the
problems so apparent in the world around us. Nonetheless, in spite of the fact that
toxins are all around us, it is rare today for a human being to die from these causes,
even though the level of toxins has dramatically increased recently due to the industrial
revolution, and earlier ignorance in using such items as lead drinking cups. We
are now aware of many of these dangers, and in the wealthier societies at least
we have largely been able to reduce these problems by pollution control. No doubt
too the fallen state since Adam has changed the world in other ways. The focus here,
though, is on humans as noted in the question in the beginning of the paper.
Some Conclusions
The problems with poisons are only due to excessive amounts and how the compounds
are used. Compounds which are highly toxic in some situations can be life-saving
in others. The toxicity problem is solely a matter of degree, that is, all compounds
are toxic in high enough levels, and no compound is toxic in low enough levels.
The toxicity concern is best described as one of fit: in one situation a compound
is functional, in another the same level is dysfunctional. The fact that low levels
of some compounds are dysfunctional in certain situations does not support the common
conclusion that some compounds are innately not dangerous and others are dangerous
or toxic. The focus should be on the proper use of a compound
in a given situation. A review of selected common poisons and toxins
demonstrates that they serve very specific roles in health even though research
on many of these elements such as arsenic and botulism toxins, has only just begun.
The reason God created toxins is because they are necessary for life, especially
in a post-Fall world. All compounds and elements can be either beneficial, neutral
or harmful, depending upon the situation and the amount.
Related article
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