Justifying the "Folate trap" in folic acid fortification programs.

Area of Science:

• Nutritional biochemistry and public health interventions.
• Folate metabolism and its implications for human health.

Background:

• Folic acid fortification of staple foods is a widespread public health strategy to increase folate levels and prevent neural tube defects (NTDs).
• The metabolic pathway of folate can lead to the formation of N(5)-methyl-THF, an inactive metabolite, termed the "folate trap."

Purpose of the Study:

• To evaluate the effectiveness of current folic acid fortification programs in light of the "folate trap" phenomenon.
• To advocate for reconsidering fortification strategies to optimize folate status and NTD prevention.

Main Methods:

• Review of folate metabolism and the implications of the "folate trap."
• Analysis of the benefits of Vitamin B(12) and [6S]-5-MTHF in folate metabolism.
• Consideration of specific population groups, such as vegetarian women in developing countries.

Main Results:

• Folic acid metabolism can result in the "folate trap," where folate is converted to an inactive form.
• Vitamin B(12) co-administration or [6S]-5-MTHF supplementation shows greater efficacy in improving folate status compared to folic acid alone.
• Vegetarian populations, particularly women in India, often have borderline Vitamin B(12) levels, exacerbating the "folate trap" issue.

Conclusions:

• Current folic acid fortification programs may be suboptimal due to the "folate trap."
• Including Vitamin B(12) in supplementation or fortification programs is recommended to prevent NTDs.
• The administration of [6S]-5-MTHF is a more effective strategy for enhancing folate status than folic acid.