Why does a deficiency in thiamine lead to reduced energy production in the body?

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Because it is necessary for amino acid transamination reactionsSince it acts as a cofactor in oxidation-reduction processesAs it serves as a coenzyme for transketolase in the pentose phosphate pathwayBecause it functions as a coenzyme for the pyruvate dehydrogenase complex

Explanation

Thiamine is essential as a coenzyme for pyruvate dehydrogenase, a key enzyme complex that converts pyruvate into acetyl-CoA, linking glycolysis to the citric acid cycle. Without thiamine, this step is impaired, leading to decreased energy production.