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However, low vitamin B 12 status in combination with high folic acid intake, in addition to the previously mentioned neuropathy risk, appeared to increase the risk of cognitive impairment in the elderly. [105] Long-term use of folic acid dietary supplements in excess of 1,000 μg/day has been linked to an increase in prostate cancer risk. [13]
As a consequence of the biochemical reactions in which homocysteine is involved, deficiencies of vitamin B 6, folic acid (vitamin B 9), and vitamin B 12 can lead to high homocysteine levels. [2] Other possible causes of hyperhomocysteinemia include genetics, excessive methionine intake, and other diseases. [3]
Common levels in Western populations are 10 to 12 μmol/L, and levels of 20 μmol/L are found in populations with low B-vitamin intakes or in the elderly (e.g., Rotterdam, Framingham). [ 17 ] [ 18 ] It is decreased with methyl folate trapping, where it is accompanied by decreased methylmalonic acid, increased folate, and a decrease in ...
Treatment may include dietary changes and folic acid supplements. [1] Dietary changes including eating foods high in folate such as, fruits and green leafy vegetables can help. [1] Prevention is recommended for pregnant women or those who are planning a pregnancy. [1] Folate deficiency is very rare in countries with folic acid fortification ...
Formiminoglutamic acid (FIGLU; conjugate base, formiminoglutamate) is an intermediate in the catabolism of L-histidine to L-glutamic acid. It thus is also a biomarker for intracellular levels of folate. The FIGLU test is used to identify vitamin B₁₂ deficiency, folate deficiency, and liver failure or liver disease.
In common forms of MTHFR deficiency, elevated plasma homocysteine levels have sometimes been treated with Vitamin B12 and low doses of folic acid. [2] Although this treatment significantly decreases the serum levels of homocysteine, this treatment is not thought to improve health outcomes. [11] [12] [13]
[28] [29] A diet rich in natural folate (350 μg/d) can show as much increase in plasma folate as taking low levels of folic acid (250 μg/d) in individuals [30] However a comparison of general population outcomes across many countries with different approaches to increasing folate consumption has found that only general food fortification with ...
Methylenetetrahydrofolate reductase (MTHFR) is the rate-limiting enzyme in the methyl cycle, and it is encoded by the MTHFR gene. [5] Methylenetetrahydrofolate reductase catalyzes the conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, a cosubstrate for homocysteine remethylation to methionine.
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