Final answer:
Megaloblastic anemia is caused by a deficiency of vitamin B12 and/or folate. Lack of meat or not consuming enough vegetables can result in a lack of folate. Sufficient folic acid intake during pregnancy is important to reduce the risk of neurological defects.
Step-by-step explanation:
Megaloblastic anemia is caused by a deficiency of vitamin B12 and/or folate. Lack of meat or a viable alternate source, and overcooking or eating insufficient amounts of vegetables may lead to a lack of folate. It is essential to provide sufficient folic acid during the early stages of pregnancy to reduce the risk of neurological defects, including spina bifida.