For every 100 kilocalories, vitamin B1 required is –
**Core Concept**
Vitamin B1, also known as thiamine, is an essential nutrient that plays a crucial role in energy metabolism. It serves as a coenzyme for several key enzymes involved in carbohydrate and lipid metabolism, particularly in the decarboxylation of alpha-keto acids in the Krebs cycle.
**Why the Correct Answer is Right**
The correct answer is related to the amount of vitamin B1 required for energy production from carbohydrates. For every 100 kilocalories of carbohydrate consumed, approximately 0.04 mg of vitamin B1 is required. This is because vitamin B1 is a crucial coenzyme for the pyruvate dehydrogenase complex, which is involved in the conversion of pyruvate to acetyl-CoA during glycolysis. This process is essential for the production of energy from carbohydrates.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because this value is too high for the amount of vitamin B1 required for energy production from carbohydrates.
**Option B:** Incorrect because this value is too low for the amount of vitamin B1 required for energy production from carbohydrates.
**Option C:** Incorrect because this value is not accurate for the amount of vitamin B1 required for energy production from carbohydrates.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that vitamin B1 deficiency can lead to beriberi, a condition characterized by weakness, fatigue, and heart failure. Beriberi is often seen in individuals with poor dietary intake of thiamine or those with increased thiamine requirements, such as during pregnancy or in individuals with certain medical conditions.
**Correct Answer:** C.