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Dietary folate intake and fecundability in two preconception cohorts
Abstract STUDY QUESTION To what extent is dietary folate intake and total folate intake (dietary and supplemental intakes) associated with fecundability, the per cycle probability of conception? SUMMARY ANSWER Preconception dietary folate intake was positively associated with fecundability in a mono...
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Published in: | Human reproduction (Oxford) 2022-04, Vol.37 (4), p.828-837 |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
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Online Access: | Get full text |
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Summary: | Abstract
STUDY QUESTION
To what extent is dietary folate intake and total folate intake (dietary and supplemental intakes) associated with fecundability, the per cycle probability of conception?
SUMMARY ANSWER
Preconception dietary folate intake was positively associated with fecundability in a monotonic pattern.
WHAT IS KNOWN ALREADY
Supplemental folic acid has been associated with improved fertility, but little is known about the relation between dietary folate and fecundability.
STUDY DESIGN, SIZE, DURATION
A prospective cohort study including 9559 women trying to conceive without fertility treatment and enrolled in the period 2013-2020.
PARTICIPANTS/MATERIALS, SETTING, METHODS
We used data from two internet-based prospective cohort studies of pregnancy planners from Denmark, where folic acid fortification is not performed (SnartForældre.dk (SF); n = 3755) and North America, where the food supply is fortified with folic acid (Pregnancy Study Online (PRESTO); n = 5804). Women contributed menstrual cycles at risk until they reported conception or experienced a censoring event. We used proportional probabilities regression models to compute fecundability ratios (FRs) and 95% CI, adjusting for potential confounders.
MAIN RESULTS AND THE ROLE OF CHANCE
Compared with a dietary folate intake ≥400 µg/day, the adjusted FRs for women in SF were 0.92 (95% CI: 0.85–0.99) for intake 250–399 µg/day, and 0.80 (95% CI: 0.68–0.94) for intake of |
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ISSN: | 0268-1161 1460-2350 |
DOI: | 10.1093/humrep/deac002 |