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Magnesium (Mg) found in all body tissue especially bones (Functions…
Magnesium (Mg)
found in all body tissue
especially bones
Functions
activator for many enzymes
More than 300 enzymes require magnesium ions for their catalytic action, including all enzymes using or synthesizing ATP and those that use other nucleotides to synthesize DNA and RNA. (
https://en.wikipedia.org/wiki/Magnesium#Biological_roles
)
metabolism of carbs, & proteins
important for energy production
proper bone formation
with Ca, P, Vit D
role in nerve cell transmission & muscle contraction
Sources
milk & meat
medium sources
milling removes much Mg
refine cereals therefore poor source
Plant foods
seeds, legumes, green leafy vegetables, whole grains
Factors affecting absorption
Decreased by
high phosphate intake
excessive calcium intake
foods high in phytate
low protein intake
Deficiency
Aetiology
not common as widely found
associated with
excessive alcohol intak
certain medications
see
http://www.magnesiumeducation.com/medications-and-magnesium
for a list
protein energy malnutrition
Elderly & patients with severe vomiting
use of diuretics over a long period
Symptoms
neuromuscular & gastrointestinal problems
behaviour changes: delirium, depression, hallucinations, nervousness
may lead to hypocalcaemia & muscle cramps
Excess
high intake of magnesium salts have laxative effect
generally not toxic unless kidney function impaired
excess stored in bones rather than excreted