葉酸缺乏通常是由于維生素吸收不足引起的。孕期和哺乳期以及兒童生長發(fā)育過程中對葉酸的需求增加。由于吸收或代謝變化或藥物的影響，攝入富含葉酸的食物無法保證所需的劑量，因此需要補充。
Deficiency of folic acid is usually caused by insufficient absorption of the vitamin. During pregnancy and lactation, the need for folic acid is increased during the growth of children. Under the influence of absorption or metabolic changes or drugs, the consumption of foods rich in folic acid cannot guarantee the dose provided, so it needs to be supplemented.
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