Magnesium:
The Key to Health and Life
|
Magnesium Homeostasis
Mainstream nutritionists generally assume that magnesium
deficiency is rare in America. The phrase "magnesium-deficiency"
is somewhat equivocal. It may refer to a dietary deficiency of
magnesium, or to significant depletions of total body magnesium
stores. Is there any reason to believe either form of magnesium
deficiency is common in America? It turns out that a host of
factors have conspired to promote a widespread prevalence of at
least mild magnesium deficiency in America, and that this
magnesium deficiency may be responsible, at least in part, for
much of the chronic ill-health of the American population.
Magnesium: Mineral Superstar
Magnesium has not attracted the degree of public attention that
has been lavished on its complement/antagonist, calcium. Yet
this public relations failure is certainly not due to any
biochemical unimportance of magnesium. Magnesium is essential to
activate over 300 different enzyme systems critical to life,
more than any other mineral.[27]
Magnesium is essential in the glycolytic cycle that converts
sugar to ATP (adenosine triphosphate) bioenergy.[36] Magnesium
helps stabilize ATP; indeed 80 percent of the magnesium inside
the cell is complexed with ATP.[36] Magnesium is intimately
involved in nucleic acid metabolism and the synthesis of DNA and
RNA.[36] Magnesium plays key roles in the second messenger
systems that mediate hormonal effects on cells.[36] Magnesium is
a major controller of cellular ion channels, governing the flow
of sodium, potassium and calcium in and out of cells.[36]
While physicians frequently use calcium channel-blocker
drugs to treat various ailments, magnesium has been called nature's
physiological calcium channel blocker.?[36] Magnesium plays
critical roles in nerve function and in the contraction and
relaxation of muscles, including the smooth muscle cells that
constrict or relax arteries.[36] In a very real sense, magnesium
is the ?mineral of life.? Magnesium is the center of the
chlorophyll molecule, without which plant life would not exist,
and so neither would the oxygen of our atmosphere, and so
neither would we. It is hard to overestimate the importance of
magnesium.
Because magnesium is so critical to human life, the body works
hard to maintain a proper balance of magnesium. Approximately 60
percent of the body's magnesium is in the skeleton; 39 percent
is inside cells (20 percent in skeletal muscle), and less than 1
percent outside the cells (mainly in the bloodstream).[27] The
maintenance of the body's stores of magnesium is a function of
three variables: dietary magnesium levels, intestinal magnesium
absorption, and magnesium excretion which is primarily
controlled by the kidneys.[27] And, unfortunately for modern
Americans, there are numerous and common problems with these
three mechanisms by which the body tries to regulate its
magnesium status.
Dietary Magnesium: Not What It Used to Be
As one study noted, The dietary intake of magnesium declined
in the United States from 475 [to] 500 milligrams per day in 1900 to 215 [to]
283 milligrams per day in 1990, possibly owing to an increase in the consumption
of processed foods. It is
difficult to reach the recommended daily allowance of 400
milligrams through diet alone. Evidence suggests that the
occidental American diet is relatively deficient in magnesium,
whereas the Oriental diet, which is characterized by a greater
intake of fruits and vegetables, is rich in magnesium.[37]
Wester points out that refining and cooking may diminish the
magnesium content of foods substantially, with boiling of
vegetables causing a loss of 50 percent of the magnesium, with
brown rice losing 80 percent of its original magnesium content
when refined into white rice.[27] Magnesium is rarely added back
to the soil in modern synthetic fertilizers, thus lowering
magnesium levels in food.[27]
Absorption Barriers
There are many factors that inhibit magnesium absorption in the
small intestine. A high calcium intake can cause magnesium
deficiency. One study's authors noted, In subjects on low
magnesium intake, calcium supplementation seems to reduce
dietary magnesium retention.[27]
Millions of Americans swallow thousands of milligrams of calcium
daily attempting to ward off osteoporosis. Ironically, research
shows, Increasing the magnesium intake improves rather than
interferes with calcium utilization.[27] A high-fat diet (the
typical American diet is 40 to 45 percent fat calories) may
decrease magnesium retention by 50 percent, even in those
consuming adequate magnesium.[38] Magnesium easily combines with
phosphoric acid to make magnesium phosphate,[27] which is
totally insoluble and precipitates out of the intestinal juices,
becoming part of the feces. Americans drink tons of phosphoric
acid-containing soft drinks. Oxalates in foods such as spinach,
rhubarb and chocolate form insoluble magnesium compounds that
cannot be absorbed. Laxatives also promote intestinal magnesium
loss.
Magnesium Recycling Barriers
The main way the body conserves its magnesium supply is through
the kidneys. Healthy kidneys typically reabsorb as much as 95
percent of the magnesium before it is excreted in the urine.[27]
Unfortunately, there are many common factors that promote the
kidneys excretion of magnesium. These include diuretics and
digitalis;[1,27] alcohol;[27] high intake of sodium and
calcium;[27] high sugar intake;[27] coffee; high blood levels of
the stress hormones adrenalin, noradrenalin and cortisol;[1,19,27]
aminoglycosides, cisplatin and cyclosporine;[1] and noise
stress.[22]
Magnesium is not routinely measured by physicians when they
order bloodwork, and usually it wouldn't matter anyway. Total
body stores and serum levels [of magnesium] are poorly
correlated; serum levels can be normal in the presence of
low intracellular stores,[1] research shows. In addition alkalotic
patients may have low serum magnesium levels without total-body
magnesium deficiency, while those with acidosis may have normal
serum levels despite deficient intracellular stores.?[1]
Wester points out that during prolonged fasting a deficit of 20
percent of total-body magnesium may occur but serum magnesium
remains unchanged. [27] How then can one detect a magnesium
deficiency problem? The Society for Magnesium Research
emphasizes the importance of patient history as well as clinical
symptoms in addition to serum ionized magnesium levels.[39]
Anyone eating the typical high-meat, high-fat,
high-sugar-and-white-flour American diet is likely to have a low
dietary magnesium intake. Anyone whose life contains the various
magnesium absorption-inhibitors mentioned previously is likely
to be poorly absorbing the magnesium in their diet. Anyone whose
life contains the anti-kidney magnesium recycling factors
mentioned above is likely to be urinating away much of their
magnesium. Another way to gauge possible magnesium deficiency is
to check for magnesium-deficiency symptoms.
Magnesium Deficiency Symptoms
Some of the common symptoms of magnesium deficiency
include:[27,40,41]
Ideally magnesium should be taken separately from calcium, and
not with a high-fat meal. If magnesium is taken with calcium, it
should definitely not be one of the two parts calcium to one
part magnesium as commonly sold in health food stores and
drugstores. A ratio of 1-to-1 calcium to magnesium will be less
likely to suppress magnesium absorption.
Vitamin B6 has been shown to increase intracellular uptake of
magnesium, so it may be useful in getting magnesium where it
belongs: inside the cell.[46] Washing a magnesium supplement
down with a soft drink is not advised, as the phosphoric acid
and sugar in the drink will definitely inhibit magnesium
absorption and retention. For those consuming any significant
quantity of alcohol, taking at least a modest dose of magnesium
at such times may reduce the micro-brain damage alcohol can
cause.[26]
Which Form of Magnesium is Best?
Studies have shown that magnesium oxide is the least
bioavailable form of magnesium,47,48 yet it has been
successfully used in a human clinical trial.[49] In general,
organic forms of magnesium such as magnesium citrate, magnesium
succinate, magnesium aspartate, magnesium lactate and magnesium
taurinate are well-absorbed forms.[47,48] Magnesium chloride is
a well-absorbed inorganic form.
When taking magnesium supplements, it is important to realize
that it may take six weeks to six months to replenish body
magnesium stores through oral supplementation.[1] Thus, if you
suffer from many of the listed magnesium deficiency symptoms and
they don't immediately disappear, don't be discouraged and
assume they aren't magnesium-related after all. Just be patient
and watch for gradual changes.
Highly recommended
source of nutrients and supplements.
References
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