Which B vitamin is not important in controlling the level of homocysteine in the bloodstream?

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Prepare for the NANP Food and Nutrition Exam with comprehensive flashcards and multiple choice questions. Each question includes hints and thorough explanations. Ensure your success on exam day!

Multiple Choice

Which B vitamin is not important in controlling the level of homocysteine in the bloodstream?

Explanation:
The levels of homocysteine in the blood are managed mainly by two vitamin-dependent pathways. Remethylation of homocysteine to methionine relies on folate as the methyl donor and vitamin B12 as a cofactor in the enzyme that transfers that methyl group. The alternative route, transsulfuration, uses vitamin B6 as a cofactor in the enzyme that converts homocysteine to cystathionine and then to cysteine. Vitamin B3, niacin, does not participate in these pathways; it functions in energy metabolism through NAD/NADP. Because B3 isn’t involved in the methionine/homocysteine cycle, it isn’t important for controlling homocysteine levels in the bloodstream.

The levels of homocysteine in the blood are managed mainly by two vitamin-dependent pathways. Remethylation of homocysteine to methionine relies on folate as the methyl donor and vitamin B12 as a cofactor in the enzyme that transfers that methyl group. The alternative route, transsulfuration, uses vitamin B6 as a cofactor in the enzyme that converts homocysteine to cystathionine and then to cysteine. Vitamin B3, niacin, does not participate in these pathways; it functions in energy metabolism through NAD/NADP. Because B3 isn’t involved in the methionine/homocysteine cycle, it isn’t important for controlling homocysteine levels in the bloodstream.

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