What is the primary function of thiamine?

Thiamine, also known as vitamin B1, plays a vital role in the body primarily because of its involvement in energy production. It is a coenzyme for several important metabolic processes, including the conversion of carbohydrates into glucose, which is then used as a source of energy. Thiamine is crucial for the decarboxylation of α-keto acids in the Krebs cycle, a key energy-making pathway in cells. This means that without adequate levels of thiamine, the body struggles to effectively utilize carbohydrates, leading to potential energy deficits.

While other vitamins and nutrients contribute to aspects like bone health, vision health, and skin health, thiamine’s core function is specifically linked to its role in metabolism and energy production, making option B the most accurate choice in this context. This clear connection to energy metabolism distinguishes thiamine from the other options, which focus on different physiological functions.