Vitamin A toxicity is associated with birth defects in the developing fetus. Which scenario best reflects this risk?

Vitamin A toxicity is associated with birth defects in the developing fetus. Which scenario best reflects this risk?

• A. Birth defects in developing fetus
• B. No effect on pregnancy
• C. Delayed puberty in offspring
• D. Increased fertility in mother

Answer: (A)

Excess vitamin A during pregnancy is teratogenic, meaning it can disrupt fetal development and cause congenital abnormalities. During early organ formation, high levels of retinoic acid alter gene signaling that guides the growth and formation of organs, leading to birth defects such as craniofacial, cardiac, and neural tube abnormalities. This is why the scenario that best reflects the risk is birth defects in the developing fetus. The other options don’t fit because they describe effects that aren’t associated with vitamin A toxicity in pregnancy—no effect on pregnancy, delayed puberty in offspring, or increased fertility in the mother—whereas high vitamin A intake is specifically linked to congenital malformations when exposure occurs during critical periods of development.

Excess vitamin A during pregnancy is teratogenic, meaning it can disrupt fetal development and cause congenital abnormalities. During early organ formation, high levels of retinoic acid alter gene signaling that guides the growth and formation of organs, leading to birth defects such as craniofacial, cardiac, and neural tube abnormalities. This is why the scenario that best reflects the risk is birth defects in the developing fetus. The other options don’t fit because they describe effects that aren’t associated with vitamin A toxicity in pregnancy—no effect on pregnancy, delayed puberty in offspring, or increased fertility in the mother—whereas high vitamin A intake is specifically linked to congenital malformations when exposure occurs during critical periods of development.