Normal-but-low serum folate levels and the risks for cognitive impairment

Soomin Jang, Ji Won Han, Jiyoon Shin, Tae Hui Kim, Kyung Phil Kwak, Kayoung Kim, Bong Jo Kim, Shin Gyeom Kim, Jeong Lan Kim, Tae Hyun Kim, Seok Woo Moon, Jae Young Park, Joon Hyuk Park, Seonjeong Byun, Seung Wan Suh, Jiyeong Seo, Yoonseop So, Seung Ho Ryu, Jong Chul Youn, Kyoung Hwan LeeDong Young Lee, Dong Woo Lee, Seok Bum Lee, Jung Jae Lee, Ju Ri Lee, Hyeon Jeong, Hyun Ghang Jeong, Jin Hyeong Jhoo, Kyuhee Han, Jong Woo Hong, Ki Woong Kim

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Abstract

Objective This study aimed to examine the association between normal-but-low folate levels and cognitive function in the elderly population using a prospective cohort study. Methods We analyzed 3,910 participants whose serum folate levels were within the normal reference range (1.5–16.9 ng/mL) at baseline evaluation in the population-based prospective cohort study named the “Korean Longitudinal Study on Cognitive Aging and De-mentia.” The association between baseline folate quartile categories and baseline cognitive disorders [mild cognitive impairment (MCI) or dementia] was examined using binary logistic regression analysis adjusting for confounding variables. The risks of incident MCI and dementia associated with the decline of serum folate level during a 4-year follow-up period were examined using multinomial logistic regression analysis. Results The lowest quartile group of serum folate (≥1.5, ≤5.9 ng/mL) showed a higher risk of cognitive disorders than did the highest quartile group at baseline evaluation (odds ratio 1.314, p=0.012). Over the 4 years of follow-up, the risk of incident dementia was 2.364 times higher among subjects whose serum folate levels declined from the 2nd–4th quartile group to the 1st quartile than among those for whom it did not (p=0.031). Conclusion Normal-but-low serum folate levels were associated with the risk of cognitive disorders in the elderly population, and a decline to normal-but-low serum folate levels was associated with incident dementia. Maintaining serum folate concentration above 5.9 ng/mL may be beneficial for cognitive status.

Original languageEnglish
Pages (from-to)532-538
Number of pages7
JournalPsychiatry Investigation
Volume16
Issue number7
DOIs
Publication statusPublished - 2019 Jul

Keywords

  • Cognition
  • Cohort studies
  • Dementia
  • Elderly
  • Folate
  • Longitudinal studies

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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  • Cite this

    Jang, S., Han, J. W., Shin, J., Kim, T. H., Kwak, K. P., Kim, K., Kim, B. J., Kim, S. G., Kim, J. L., Kim, T. H., Moon, S. W., Park, J. Y., Park, J. H., Byun, S., Suh, S. W., Seo, J., So, Y., Ryu, S. H., Youn, J. C., ... Kim, K. W. (2019). Normal-but-low serum folate levels and the risks for cognitive impairment. Psychiatry Investigation, 16(7), 532-538. https://doi.org/10.30773/pi.2019.05.29