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Betaine supplementation lowers plasma homocysteine in healthy men and women

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Author: Steenge, G.R. · Verhoef, P. · Katan, M.B.
Type:article
Date:2003
Source:Journal of Nutrition, 5, 133, 1291-1295
Identifier: 237055
Keywords: Health · Physiological Sciences · Betaine · Folic acid · Homocysteine metabolism · Intervention study · Methionine-loading test · 5 methyltetrahydrofolic acid · betaine · homocysteine · methionine · placebo · adult · amino acid blood level · amino acid metabolism · area under the curve · article · body mass · cardiovascular disease · cardiovascular risk · clinical trial · controlled clinical trial · controlled study · diet restriction · diet supplementation · drug efficacy · female · human · loading test · male · randomized controlled trial · Adult · Betaine · Blood Glucose · Blood Pressure · Body Mass Index · Diet · Dietary Supplements · Eating · Fasting · Female · Folic Acid · Homocysteine · Humans · Lipids · Male · Reference Values

Abstract

Elevated levels of plasma total homocysteine are associated with a higher risk of cardiovascular disease. Betaine and 5-methyltetrahydrofolate can remethylate homocysteine into methionine via independent reactions. We determined the effect of daily betaine supplementation, compared with both folic acid and placebo, on plasma concentrations of total homocysteine after an overnight fast and after methionine loading in men and women with mildly elevated homocysteine. Groups of twelve subjects ingested 6 g betaine, 800 μg folic acid with 6 g placebo or 6 g placebo each day for 6 wk. A methionine-loading test (i.e., ingestion of 100 mg L-methionine/kg body mass) was performed before and after 6 wk of supplementation. Fasting plasma homocysteine decreased by 1.8 μmol/L (95% confidence interval [CI]; -3.6, 0.0, P < 0.05) in the betaine group and by 2.7 μmol/L (95% CI: -4.5, -0.9, P < 0.05) in the folic acid group. These changes are relative to the change in the placebo group, in which fasting plasma homocysteine rose by 0.5 μmol/L. Furthermore, betaine suppressed the total area under the plasma homocysteine-time curve after methionine loading by 221 μmol. 24 h/L (95% CI: -425, -16, P < 0.05) compared with placebo, whereas folic acid had no effect. In conclusion, betaine appears to be highly effective in preventing a rise in plasma homocysteine concentration after methionine intake in subjects with mildly elevated homocysteine. It is not known whether this potential of betaine to "stabilize" circulating homocysteine concentrations lowers the risk of cardiovascular disease.