Because humans don't produce their own vitamin C, it is important that we get enough of this vital nutrient on a regular basis
When we get a cold, the first thing we are told is to get some vitamin
C into our bodies. Even though a number of studies have found that taking
vitamin C doesn’t prevent us from getting colds
and flu, it does appear to strengthen our immunity – so, basically, the
advice is good, and at the very least can’t do any harm.
Everyone
knows how vitamin C in lemons cured scurvy in the eighteenth century, but the
first doctor who started using vitamin C aggressively to treat illness was Frederick R. Klenner in
the 1940s. He cured polio, measles, mumps, tetanus, chicken pox and a number of
other diseases with massive doses of vitamin C.
This may sound like a tall story, but Dr Klenner used vitamin C therapy
for over forty years and wrote many medical papers on the subject which can be
found in the Clinical
Guide to the Use of Vitamin C, edited by Lendon H. Smith,
M.D.
Humans lost an enzyme
An interesting
fact is that there are only four groups of mammals that do not produce vitamin C
in their bodies, i.e. humans, other primates (e.g. apes and monkeys), guinea
pigs and fruit bats.
The reason for this phenomenon is that of the four enzymes needed to convert
glucose into vitamin C we have only three. Humans lost the fourth
(L-gulonolactone Oxidase) somewhere during the course of our evolution –
presumably because our diets were abundant in vitamin C.
In mammals that produce their own vitamin C, it is created mainly as a
response to stress.
Under normal circumstances a mammal the size of the average human being (±70kg)
produces 5,000 to 10,000 milligrams per day. However, when the animal is under
stress, it produces four times that amount. When under stress a goat can make up
to 100,000 milligrams of vitamin C!
Is our RDA for vitamin C too
low?
The recommended daily allowance (RDA) of this vitamin for
humans is below 100 milligrams per day, which seems rather low and could be the
reason why animals that make a lot of vitamin C are much less prone to the
diseases that we suffer from. They can also live up to 10 times beyond their
physical maturity, compared to a maximum of 4 times for humans. Hypothetically,
this means that if we take 20 as the age of physical maturity for humans,
we could live up to 200 years if we produced our own vitamin C.
Dr Thomas Levy, author of Vitamin
C, Infectious Diseases, and Toxins: Curing the Incurable maintains that “a
human's inability to make the enzyme L-gulonolactone Oxidase must be considered
an inborn error of metabolism” and that doctors should “consider this lack of
enzyme activity in every medical condition”.
Linus
Pauling
Perhaps the most famous name in the field of vitamin C
research is Linus Pauling, one of the most important scientists of the 20th
century. Pauling is the only person who ever received two unshared Nobel Prizes:
the Nobel Prize in Chemistry (1954) and the Nobel Peace Prize (1962).
Pauling became interested in the idea of high-dose vitamin C in 1966 and
started taking 3 g per day. In 1970 he published Vitamin C and the Common
Cold which helped to make vitamin C popular with the public. His best
known book on health and vitamin therapy is How to Live Longer and Feel
Better (1986).
In Vitamin C and the Common Cold,
Pauling encouraged people to take a daily dose of 3,000 milligrams of
vitamin C, which is 50 times the RDA. He believed that this would wipe out the
common cold. The medical fraternity wasn’t quite as enthusiastic, and a number
of scientific tests indicated that vitamin C did not “have any important effect
on the duration or severity of infections of the upper respiratory tract”.
He also believed that vitamin C could cure cancer and refused to be put
off by strong opposition from the scientific and medical
establishments.
Oral vs. intravenous
Pauling
found that cancer patients who received vitamin C lived four times longer than
those who received no vitamin C. High-dose vitamin C was administered as sodium
ascorbate, given orally and intravenously.
Dr. Charles Moertel of the
Mayo Clinic, who was the main opponent of Pauling’s thesis set about disproving
his findings. In his tests he administered large amounts of oral vitamin C to
the patients in his group, and when they failed to show improvements over
patients not receiving vitamin C in the study, Moertel announced that Pauling’s
hypothesis was wrong. He had conveniently forgotten that Pauling’s patients
received both oral and intravenous vitamin C.
This had a considerable impact on the reputation of vitamin C as an effective
tool against cancer
for a number of years, but in recent times people like Dr Hugh Riordan
of Kansas have validated the benefits of intravenous vitamin C. Studies have
indicated that oral vitamin C is poorly absorbed and that given intravenously it
is much more effective against cancer.
Vitamin C has to be
constantly replenished
Nowadays vitamin C is back in favour and
is being used to protect against conditions as diverse as high
blood pressure, heart
disease, asthma,
and cancer.
Even the National
Cancer Institute (NCI) which forms part of the U.S. Department of Health and
Human Services is singing the praises of vitamin C in the battle against cancer,
and states in an overview of high-dose vitamin C: “Laboratory studies have
reported that high-dose vitamin C has pro-oxidant properties and decreased cell
proliferation in prostate, pancreatic, hepatocellular, colon, mesothelioma, and
neuroblasoma cell lines."
Because vitamin C is a water-soluble vitamin it cannot be stored in the body
for long and has to be replenished on a regular basis. Some of the best dietary
sources of vitamin C are:
- Bell peppers
- Guavas
- Dark green leafy vegetables
- Kiwi fruit
- Broccoli
- Berries
- Citrus fruits
- Tomatoes
- Peas
- Papayas
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