Which factor is known to limit folate absorption?

• A. Chronic alcohol consumption
• B. Increased dietary fat
• C. Vitamin C excess
• D. High calcium intake

Answer: (A)

Chronic alcohol consumption is known to limit folate absorption because ethanol directly damages the lining of the small intestine and disrupts the function of the folate transport mechanisms in enterocytes. This damage reduces the intestinal uptake of folate from the lumen, and alcohol also contributes to lower hepatic storage and altered metabolism of folate, compounding the deficiency. In clinical practice, alcohol use is a common cause of folate deficiency beyond dietary intake alone.

Other factors listed do not have the same well-established impact on folate absorption. For example, increased dietary fat does not inherently hinder folate uptake, and excess vitamin C or high calcium intake are not recognized as primary limiting factors for folate absorption.