Folate intake and ovarian reserve among women attending a fertility center

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Authors:

Mumta Kadir, M.P.H., Robert B. Hood, Ph.D., Lidia Mínguez-Alarcón, Ph.D., Ana Belén Maldonado-Cárceles, M.D., M.P.H., Jennifer B. Ford, B.S.N., Irene Souter, M.D., Jorge E. Chavarro, M.D., Sc.D., Audrey J. Gaskins, Sc.D. for theEARTH Study Team

Abstract:

Objective

To examine the association between dietary folate intake and antral follicle count (AFC) among women seeing treatment for infertility.

Design

Cohort study.

Setting

Academic fertility center.

Patients

A total of 552 women attending the Massachusetts General Hospital Fertility Center (2007–2019) who participated in the Environment and Reproductive Health Study.

Interventions

None. Folate intake was measured with a validated food frequency questionnaire at study entry. Multivariable Poisson regression models with robust standard errors were used to estimate the association of folate intake with AFC adjusting for calorie intake, age, body mass index, physical activity, education, smoking status, year of AFC, and intakes of vitamin B12, iron, and vitamin D. Nonlinearity was assessed with restricted cubic splines.

Main Outcome Measure

AFC as measured by transvaginal ultrasonography as part of routine care.

Results

Among the 552 women (median age, 35.0 years; median folate intake, 1,005 μg/d), total and supplemental folate intake had a significant nonlinear relationship with AFC. There was a positive linear association with AFC up to approximately 1,200 μg/d for total folate intake and up to 800 μg/d for supplemental folate intake; however, there was no additional benefit of higher folate intakes. The magnitude of the association was modest; for example, the predicted adjusted difference in AFC between a woman consuming 400 vs. 800 μg/d of supplemental folate was approximately 1.5 follicles.

Conclusion

Higher intake of folate, particularly from supplements, was associated with modestly higher ovarian reserve as measured by AFC among women attending a fertility center.

Clinical Trial Registration Number

This trial was registered at clinicaltrials.gov as NCT00011713.

Fertility and Sterility

Editorial Office, American Society for Reproductive Medicine

Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders.