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Could a Common B-12 Deficiency Be Causing Your Symptoms?

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By Dr. Dana Myatt, NMD, and Mark Ziemann, RN* • www.ProHealth.com • March 10, 2008


Less than 20 years ago, patients complaining of fatigue were often given a "tonic shot" by their doctor. Many people claimed this worked like magic to improve their energy levels. What was this miracle tonic? A simple injection of vitamin B-12.

Although the practice of administering vitamin B-12 injections has fallen out of favor, modern medical science now understands why vitamin B-12 supplementation makes people feel better, and the reasons extend far beyond just the "placebo effect" of receiving a shot.

The Far-Reaching Effects of Vitamin B-12 Deficiency

Vitamin B-12, called "cobalamin" because it contains the mineral cobalt, is required for a staggering number of physical functions and chemical reactions. Best known for its participation in the manufacture of red blood cells, B-12 is also needed for production and maintenance of the myelin sheath that surrounds nerves and for production of DNA, the genetic material of all cells. And that’s just the beginning.

The serious health consequences of vitamin B-12 deficiency can adversely affect nearly every system in the body.

Energy: Even minor deficiencies of vitamin B-12 can cause anemia, fatigue, shortness of breath and weakness.

The Nervous System: Deficiencies of B-12 can cause neurological changes including numbness and tingling in the hands and feet, balance problems, depression, confusion, poor memory and Alzheimer's-like symptoms. Long-term deficiencies of B-12 can result in permanent impairment of the nervous system.

The Gastro-Intestinal System: B-12 deficiency can cause decreased appetite, constipation, diarrhea or alternating constipation/diarrhea, weight loss and abdominal pain.

The Immune System: Vitamin B-12 is necessary for normal functioning of white blood cells. Studies show that B-12 helps regulate Natural-Killer T-cells and prevents chromosome damage.

The Cardiovascular System: Vitamin B-12 participates in the conversion of homocysteine to methionine. Elevated homocysteine levels are a known independent risk factor for heart attack, stroke and thrombosis. Without adequate B-12 levels, homocysteine levels typically rise.

Special Senses: Degenerative changes in the central nervous system caused by B-12 deficiency can also affect the optic nerve, resulting in blue-yellow color blindness.

Other symptoms of vitamin B-12 deficiency include sore mouth or tongue.

With so many physical functions at risk, it is easy to understand why knowledgeable clinicians and researchers consider B-12 supplementation beneficial.

Are You At Risk for a Vitamin B-12 Deficiency?

Medical science once believed that few people were vitamin B-12 deficient. This false assumption may stem from the fact that vitamin B-12 is produced in the body by a normal, healthy population of bowel bacteria.

Secondly, unlike other water-soluble vitamins, B-12 is stored in the liver, kidneys and other tissues. Deficiencies of B-12 often appear so slowly and subtly as to go unnoticed, and blood tests for vitamin B-12 levels miss early deficiency states at least 50% of the time.

So, who is at risk for vitamin B-12 deficiency? Recent research shows that a much larger segment of the population is likely deficient than previously thought.

Because assimilation of vitamin B-12 from food requires adequate stomach acid and intrinsic factor, and because stomach acid typically declines with age, people over 50 were once thought to be the biggest “at risk” population for B-12 deficiency. Previous studies showed 3% to 39% of seniors to be vitamin B-12 deficient, but newer studies suggest that number may be as high as 72% to 78%.

Vegetarians and vegans are another population believed to be at high risk for B-12 deficiency, in part because of low animal food intake of vitamin B-12 and also because many vegetable sources such as seaweed must be consumed in large amounts in order to provide adequate vitamin B-12.

Other high-risk groups for B-12 deficiency include:

  • Those who use acid-blocking or neutralizing drugs (such as Prilosec, Prevacid, Nexium and others), or drugs which impair intestinal absorption (such as Metformin, Questron and Chloromycetin),
  • People who have had gastric surgery,
  • And people who have chronic illnesses such as ME/CFS and Fibromyaligia.

Bacterial overgrowth of the small intestine, which occurs frequently in people with low stomach acid, is a predisposing factor for B-12 deficiency because the bacteria themselves use vitamin B-12.

The most recent and disturbing studies suggest that vitamin B-12 deficiency is more prevalent in young adults than previously thought. One study found that vitamin B-12 deficiency was similar in three age groups (26-49 years, 50-64 years, and 65 years and older), but that early symptoms were simply less apparent in the young.

This study also found that those who did not take a vitamin B-12 containing supplement were twice as likely to be deficient as supplement users, regardless of age.

Four Forms of B-12 - Which One is Best?

Cobalamin is a collective term for four closely related forms of B-12 - cyanocobalamin, methylcobalamin, hydroxycobalamin, and adenosylcobalamin (dibencozide).

Cyanocobalamin, the most common form of B-12 found in nutritional supplements, has the lowest biological activity and must be converted in the liver to methylcobalamin or adenosylcobalamin before it can be utilized.

Because it can be converted to other forms of B-12, cyanocobalamin can be considered the “mother form” of B-12. However, this conversion is inefficient and some people may not benefit from cyanocobalamin due to lack of assimilation or conversion.

Methylcobalamin is considered by many researchers to be the most active form of vitamin B-12. It protects the nervous system by regulating glutamate-induced neuronal damage (common in aging) and promoting nerve cell regeneration.

Methylcobalamin is the only form of vitamin B-12 that participates in regulating circadian rhythms (sleep/wake cycles). It has been shown to improve sleep quality and refreshment from sleep, as well as increasing feelings of well-being, concentration and alertness.

Adenosylcobalamin (dibencozide), the second highly active form of vitamin B-12, is essential for energy metabolism. It is required for normal myelin sheath formation and nucleoprotein synthesis. Deficiencies are associated with nerve and spinal cord degeneration.

Hydroxocobalamin is a unique form of B-12 that participates in detoxification, especially cyanide detoxification. Cyanide levels are often elevated in smokers, people who eat cyanide-containing food (like cassava) and those with certain metabolic defects.

Excess cyanide in the tissues blocks conversion of cyanocobalamin to methylcobalamin or adenosylcobalamin. In such instances, hydroxocobalamin may be the vitamin B-12 of choice. Hydroxycobalamin is FDA-approved as a treatment for cyanide poisoning.

Oral Vs. Injectable: Which Delivery System is Preferred?

Although many people including some physicians still believe that injectable vitamin B-12 is the preferred route of administration, it is well-known and widely accepted that oral vitamin B-12 is equally as effective as injection in treating pernicious anemia and other B-12 deficient states.

Conclusions and Recommendations

Vitamin B-12 deficiency is far more widespread than previously thought, with up to 30% of young people affected and possibly as many as 78% of the over 50 population suffering from deficiency.

Those at special risk include:

  • Seniors,
  • Vegetarians and vegans,
  • People taking acid-neutralizing drugs or various other drugs, and
  • Patients with cognitive impairment and/or chronic illnesses.

The U.S. Institute of Medicine recommends that adults over 50 obtain their vitamin B-12 from supplements.

Because symptoms of vitamin B-12 deficiency often manifest months or years before B-12 blood tests become abnormal, early deficiencies are often missed.

Symptoms and side effects of B-12 deficiency are many and varied, can mimic other diseases such as Chronic Fatigue Syndrome, and can produce irreversible changes of the nervous system if not corrected early.

Oral vitamin B-12 supplementation is extremely safe, as effective as injections, comparatively inexpensive, and more convenient than injections.

Those at risk of vitamin B-12 deficiency or with symptoms suggestive of B-12 deficiency should consider adding this important nutrient to their supplement protocol.

[Note: To read about Vitamin B-12's important role in the biochemistry of ME/CFS and FM click here. Myatt and Ziemann explain how forms of vitamin B-12 deficiency may be related to two biochemical abnormalities heavily involved in ME/CFS, Fibromyalgia, and other the “unexplained illnesses” (ME/CFS, Fibromyalgia, Multiple Sensitivities, Gulf War Syndrome, PTSD). These are: 1) Dr. Martin Pall’s model of a dysregulated Nitric Oxide/Peroxynitrite (“No, Oh No!”) Cycle, and 2) the focus of Rich Van Konynenburg's studies of fatigue - dysregulation of the Methylation Cycle.]

____
* Dr. Dana Myatt, NMD, is a practicing naturopathic family physician, educator, author, and speaker with a special interest in nutrition. She lectures widely to medical and lay audiences, and hosts a website (http://www.drmyattswellnessclub.com). Mark Ziemann, RN, Dr. Myatt’s husband and collaborator, is also an educator, author, and speaker specializing in holistic nursing practice and patient education.

A footnoted version of this article, including 78 references, will be available soon on Immunesupport.com/

Note: This information has not been evaluated by the FDA. It is generic and is not meant to prevent, diagnose, treat, or cure any condition, illness, or disease. It is very important that you make no change in your healthcare plan or health support regimen without researching and discussing it in collaboration with your professional healthcare team.



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