Which statement about thiamine's role in metabolism?

Which statement about thiamine's role in metabolism?

• A. Thiamine functions only as an antioxidant in plasma.
• B. Thiamine is essential for carbohydrate metabolism and energy production in cells.
• C. Thiamine is not necessary for nervous system function.
• D. Thiamine deficiency only affects the eyes.

Answer: (B)

Thiamine acts as a crucial cofactor in key enzymes that turn carbohydrates into usable energy. In its active form, thiamine pyrophosphate supports pyruvate dehydrogenase to link glycolysis to the TCA cycle and helps α-ketoglutarate dehydrogenase drive the TCA cycle itself, while transketolase operates in the pentose phosphate pathway. This makes thiamine essential for efficient carbohydrate metabolism and ATP production, especially in tissues with high energy demands like the brain and heart. Therefore, the statement that thiamine is essential for carbohydrate metabolism and energy production in cells best captures its role. The other claims aren’t correct: thiamine isn’t primarily an antioxidant, it is important for nervous system function, and deficiency affects multiple systems, not just the eyes.

Thiamine acts as a crucial cofactor in key enzymes that turn carbohydrates into usable energy. In its active form, thiamine pyrophosphate supports pyruvate dehydrogenase to link glycolysis to the TCA cycle and helps α-ketoglutarate dehydrogenase drive the TCA cycle itself, while transketolase operates in the pentose phosphate pathway. This makes thiamine essential for efficient carbohydrate metabolism and ATP production, especially in tissues with high energy demands like the brain and heart. Therefore, the statement that thiamine is essential for carbohydrate metabolism and energy production in cells best captures its role. The other claims aren’t correct: thiamine isn’t primarily an antioxidant, it is important for nervous system function, and deficiency affects multiple systems, not just the eyes.