Question at position 30 Why were cereals and grains fortified with folic acid in the 1990s?To reduce the incidence of macrocytic anemiaTo reduce the incidence of cancerTo reduce the incidence of neural tube defects in newborn childrenTo reduce the incidence of hyperhomocysteinemia

Question

BlackTom AI · Accepted Answer

Folic acid fortification of cereals and grains in the 1990s was implemented primarily to prevent neural tube defects (NTDs) in developing embryos.

1) Relevant knowledge points and concepts
- Folate (vitamin B9) is essential for DNA synthesis, cell division, and methylation reactions. Adequate maternal folate around conception reduces risk of NTDs such as spina bifida and anencephaly.  
- The neural tube closes by about the 4th week of gestation, often before a woman knows she is pregnant, so periconceptional folate intake must already be adequate.  
- Public health fortification of staple foods ensures broad population coverage, particularly women of childbearing age who may not take supplements.

2) Step-by-step reasoning
- Randomized trials and observational studies in the 1980s showed that periconceptional folic acid supplementation markedly reduced NTD recurrence and incidence.  
- Because many pregnancies are unplanned, individual supplementation programs would miss many at-risk pregnancies.  
- Fortification of widely consumed grains guarantees baseline folic acid intake across the population, raising red blood cell folate levels in women of reproductive age before conception.  
- After fortification policies (e.g., U.S. mandate in 1998), epidemiologic surveillance reported substantial reductions in NTD rates, confirming the intervention’s goal and effectiveness.

3) Intermediate data/logic (no complex arithmetic required)
- Empirical data from national programs showed declines in NTD incidence after fortification, supporting causation between added folic acid and fewer NTDs.

4) Why the correct answer is correct
- The primary, evidence-based public health rationale for fortification was to reduce neural tube defects because timing of neural tube closure necessitated pre-pregnancy folate sufficiency; fortification ensured that requirement at the population level.

5) Why other choices are incorrect
- Macrocytic anemia: folate prevents this, but preventing anemia was not the main driver for mass fortification.  
- Cancer: the relationship between folate and cancer is complex and not the reason for fortification; folate was not added to reduce cancer incidence.  
- Hyperhomocysteinemia: folate lowers homocysteine, but reducing homocysteine-related outcomes was not the fortification policy’s primary goal.

6) Conclusion
The correct answer is: To reduce the incidence of neural tube defects in newborn children, which matches the provided answer.

Question at position 30 Why were cereals and grains fortified with folic acid in the 1990s?To reduce the incidence of macrocytic anemiaTo reduce the incidence of cancerTo reduce the incidence of neural tube defects in newborn childrenTo reduce the incidence of hyperhomocysteinemiaSingle choice

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