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Vitamins: Why Do We Take Supplements

February 2nd, 2006

[image: Vitamins: Why Do We Take Supplements]

B-100 Complex vitamin

Vitamins supplements are so common among us. We can easily buy them at

supermarkets or our local drugs store. But what are vitamins? And why should

we take them? Nobel Laureate, Fritz Lipmann, once commented, " Doctors like

to prescribe vitamins and millions of people take them, but it requires a

good deal of biochemical sophistication to understand why they are needed

and how the organism uses them. "

Vitamins are essential micronutrients that the body cannot supply in

sufficient quantities. They therefore must be obtained from the environment

(diet or supplements). For simplification, vitamins are classified in two

groups, according to whether they are water-soluble or fat-soluble. The

water-soluble vitamins include vitamin C and the B-complex vitamins; these

are considered for the most part relatively non-toxic. The fat-soluble

vitamins, A, D, E, K, tend to accumulate in tissues and can be quite toxic

at high doses.

What are Enzymes?

Enzymes are the work horses of the body in that they function to facilitate

biochemical reactions necessary for activities such as muscle contraction,

wound healing, digestion of food, metabolism of carbohydrate, fat and

protein, and virtually all the numerous chemical reactions necessary for

growth and vitality. The body manufactures approximately 4,000 different

enzymes, and 22% of them require a helper molecule, a coenzyme, to carry out

their activity. The relatively tiny B vitamin fits snugly into a specific

site on the enzyme, much like a ball in a catcher's mitt. This interaction

between enzyme and vitamin must be a near perfect fit for the enzyme to be

active. Once this reaction is complete, the enzyme, now known as a

holoenzyme, can perform work for the cell.

Why should we supplement with vitamins?

Many people, especially as we age, require more nutrients than the diet

supplies. Unfortunately, few of us eat the recommended 5-7 servings of

fruits and vegetables per day. Scientific evidence continues to accumulate

to strengthen the view that vitamin deficiencies are more common than

previously thought. It has been estimated that at least 50 human genetic

diseases are caused by specific errors in the DNA blueprint, and that these

diseases can be corrected or attenuated by taking vitamins several-fold in

excess of the recommended daily intake. Other disorders that may be related

to genetic factors and vitamin deficiencies include fibromyalgia, chronic

fatigue syndrome, migraine, rage, depression, bipolar, and other more minor

disorders.

How can mega-dosing with a particular vitamin make up for some genetic

errors?

Vitamins must fit tightly in the pocket of the enzyme for full activity. If

an enzyme is produced from a gene containing a genetic error (especially in

the formation of the vitamin pocket), the error will most likely affect the

ability of the enzyme to bind with the vitamin. This will result in reduced

enzyme activity, because the vitamin will not be properly fitted to the

enzyme. However, enzymologists working in the laboratory have demonstrated a

method to force the vitamin into a pocket of an enzyme with low binding

affinity. The technique involves raising the concentration of the vitamin,

thereby increasing the chance of a productive interaction between the

vitamin and its binding site (pocket) on the enzyme.

This is precisely what is believed to occur in some of the 50 or so known

genetic diseases that are corrected or improved by ingestion of mega doses

of vitamins. The high doses essentially force the imperfect pocket to pop

into the vitamin-binding conformation, thereby creating the active

holoenzyme. Other genetic errors can also interfere with the transport of

the vitamin into the cell. For example, a protein known as intrinsic factor

is produced by the stomach and functions as a vehicle to carry vitamin B-12

from the intestine into the plasma. A defect in this factor will also

produce a B-12 deficiency, which can be corrected by B-12 injections or high

doses of sublingual B-12; both of which by-pass the intrinsic factor block.

Since many vitamins have carrier proteins, this type of error is potentially

more common than presently realized. Furthermore, stomach acidity is

important in vitamin absorption and it is known that some individuals (more

common in the elderly) have low vitamin absorption due to abnormal stomach

acidity, which again may be corrected by high-dose vitamin therapy.

Vitamins may also serve a role in protecting enzymes from free radical

attack. Enzymes are longer-lived when they are in the company of substances

they normally work with or bind to, such as the vitamins. The enzyme-bound

vitamin affords a shield from free radical attack, as well as promoting a

more compact, stable enzyme structure.

How much should one take?

One should avoid taking vitamins in excess of the safe upper limit (UL),

unless prescribed by a qualified physician. This safe UL can be several

hundred times the recommended daily required intake, yet clearly within the

range of the vitamins and minerals present in one multiple vitamin plus a

super-B complex per day. A complete list of vitamin-mineral UL can be

obtained from the US government National Institutes of Health Office of

Dietary Supplements.

The U.S. Government's dietary guideline of 5 to 7 fruits and vegetables per

day is widely cited, but often not well understood. Will 5 fruits and no

vegetables meet the guideline? What about all veggies and no fruit? Could

it be that they mean 5 to 7 fruits AND 5 to 7 vegetables?

Detailed examination of the guidelines reveals that the recommendation is to

consume at least 2 servings of fruits and 3 servings of vegetables per day.

The rationale is that different fruits and vegetables provide different

nutrients. For further information and details on what constitutes a

serving, go to Dietary Guidelines: Build a Healthy Base at www.health.gov.

Although the need for vitamins and minerals is widely recognized, most

people don't bother to take supplements that would ensure adequate vitamin

intake. A national survey by the Centers for Disease Control and Prevention

produced data indicating that 60% of the U.S. population had not taken at

least 1 vitamin or mineral in the past month.

Vitamin C is the most commonly consumed vitamin, followed by several B

vitamins. Vitamin E is 7th, A is 8th and D is 9th on the list of the top ten

most common ingredients. Folic acid, well known for its importance during

pregnancy, is 10th.

Vitamin consumption correlates with age, education, gender and geography.

The groups with the highest vitamin supplementation are those who are

non-Hispanic whites, women, 50 and over, have 13+ years of education, and

live in the West.

For most of us, vitamins are synonymous with good health. Yet most Americans

do not take vitamins. Changing diets affects the need for vitamins, as does

dosage requirements, since older bodies don't absorb vitamins as well as

younger ones.

http://www.bestsyndication.com/Articles/2006/n/nakamura_ito/020206-vitamins_why_\

we_take_them.htm

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