Folic Acid Supplementation in Pregnant Women: Dose Response
| Status: | Completed |
|---|---|
| Conditions: | Women's Studies |
| Therapuetic Areas: | Reproductive |
| Healthy: | No |
| Age Range: | 18 - 40 |
| Updated: | 4/17/2018 |
| Start Date: | May 2014 |
| End Date: | December 2017 |
The proposed study is a double-blind randomized controlled trial in healthy pregnant women
(BMI 18.5 - 29.9 kg/m2, age 18 - 40 yr) receiving prenatal care at Athens Regional Midwifery
clinic (ARMC).
The primary goal of the proposed study is to determine relative changes in blood folate and
DNA methylation levels in response to 2 different supplemental doses of folic acid one of
which will provide the Institute of Medicine's recommended folate intake for pregnant women
and the second will provide a higher dose as routinely taken by pregnant women in
over-the-counter prenatal supplements.
The specific aims of the study are:
1. to compare maternal serum and red blood cell (RBC) folate levels and % change in women
taking either 400 or 800 mcg/day of supplemental folic acid from the first prenatal
visit (< 10 weeks) through delivery;
2. to compare the infant's cord blood folate levels in response to different maternal folic
acid intakes (400 mcg/d vs 800 mcg/d);
3. to determine relative differences in the levels of oxidized folic acid in maternal and
infant blood in response to 400 or 800 mcg/d folic acid dose, and
4. to determine genome wide and gene specific DNA methylation response in pregnant women
receiving prenatal supplements containing either 400 or 800 mcg folic acid per day
(BMI 18.5 - 29.9 kg/m2, age 18 - 40 yr) receiving prenatal care at Athens Regional Midwifery
clinic (ARMC).
The primary goal of the proposed study is to determine relative changes in blood folate and
DNA methylation levels in response to 2 different supplemental doses of folic acid one of
which will provide the Institute of Medicine's recommended folate intake for pregnant women
and the second will provide a higher dose as routinely taken by pregnant women in
over-the-counter prenatal supplements.
The specific aims of the study are:
1. to compare maternal serum and red blood cell (RBC) folate levels and % change in women
taking either 400 or 800 mcg/day of supplemental folic acid from the first prenatal
visit (< 10 weeks) through delivery;
2. to compare the infant's cord blood folate levels in response to different maternal folic
acid intakes (400 mcg/d vs 800 mcg/d);
3. to determine relative differences in the levels of oxidized folic acid in maternal and
infant blood in response to 400 or 800 mcg/d folic acid dose, and
4. to determine genome wide and gene specific DNA methylation response in pregnant women
receiving prenatal supplements containing either 400 or 800 mcg folic acid per day
The study will be conducted in healthy women with a BMI within the ranges of 18.5 - 35.0
kg/m2. There will be two treatment groups: (1) one group taking 400 mcg per day of folic acid
as part of a prenatal supplement, beginning at study enrollment (< 10 weeks gestational age)
and (2) a second group taking 800 mcg per day of folic acid as part of the prenatal
supplement. Both groups will be provided identical composition of prenatal supplements other
than folic acid content. Repeated measures of outcome variables will be determined in blood
samples collected at various times during pregnancy and at delivery. Due to the role of
prenatal supplementation in helping maintain optimal nutrition status throughout pregnancy,
there will be no placebo control.
Women will be recruited through the Athens Regional Medical Center Midwifery Practice and all
blood draws associated with this study will be conducted during scheduled prenatal visits.
The research protocol is consistent with the standard of care provided by the clinic and will
not affect the prenatal services provided to the research participants. Following consent at
the first prenatal visit, participants will be randomly assigned to receive prenatal
supplements containing either 400 or 800 mcg of folic acid (all other ingredients at
unmodified concentrations). The 400 mcg dose approximates the current Recommended Dietary
Allowance (RDA) for pregnant women of 600 mcg Dietary Folate Equivalents (400 mcg folic acid
≈ 600 mcg DFEs; conversion factor based on higher bioavailability of folic acid is: 1 mcg
folic acid = 1.7 mcg DFE). The higher dose of 800 mcg folic acid represents an amount
commonly found in over-the-counter prenatal supplements. Women will be asked to take the
supplements daily throughout the duration of gestation and to follow their standard prenatal
diet, with the exception of avoiding highly fortified (> 100% RDA) ready-to-eat cereals and
fortified energy/snack bars and drinks, due to their high folic acid content.
At the first visit, the participants will be instructed in the use of a dietary recall data
collection sheet (food diary) which they will be asked to complete during specific time
points during the study. Each set of dietary recalls will include information for three 24-hr
periods on non-consecutive days including one weekend day. Dietary recall information will be
obtained at approximately weeks 16 and 32 of gestation. This will permit assessment of
typical dietary intake of total calories and specific nutrients, including folate.
Blood samples will be collected, in the non-fasting state, at the first, 28 week and 36 week
prenatal visits and from the mother and cord blood at delivery for determination of primary
outcome measures.
kg/m2. There will be two treatment groups: (1) one group taking 400 mcg per day of folic acid
as part of a prenatal supplement, beginning at study enrollment (< 10 weeks gestational age)
and (2) a second group taking 800 mcg per day of folic acid as part of the prenatal
supplement. Both groups will be provided identical composition of prenatal supplements other
than folic acid content. Repeated measures of outcome variables will be determined in blood
samples collected at various times during pregnancy and at delivery. Due to the role of
prenatal supplementation in helping maintain optimal nutrition status throughout pregnancy,
there will be no placebo control.
Women will be recruited through the Athens Regional Medical Center Midwifery Practice and all
blood draws associated with this study will be conducted during scheduled prenatal visits.
The research protocol is consistent with the standard of care provided by the clinic and will
not affect the prenatal services provided to the research participants. Following consent at
the first prenatal visit, participants will be randomly assigned to receive prenatal
supplements containing either 400 or 800 mcg of folic acid (all other ingredients at
unmodified concentrations). The 400 mcg dose approximates the current Recommended Dietary
Allowance (RDA) for pregnant women of 600 mcg Dietary Folate Equivalents (400 mcg folic acid
≈ 600 mcg DFEs; conversion factor based on higher bioavailability of folic acid is: 1 mcg
folic acid = 1.7 mcg DFE). The higher dose of 800 mcg folic acid represents an amount
commonly found in over-the-counter prenatal supplements. Women will be asked to take the
supplements daily throughout the duration of gestation and to follow their standard prenatal
diet, with the exception of avoiding highly fortified (> 100% RDA) ready-to-eat cereals and
fortified energy/snack bars and drinks, due to their high folic acid content.
At the first visit, the participants will be instructed in the use of a dietary recall data
collection sheet (food diary) which they will be asked to complete during specific time
points during the study. Each set of dietary recalls will include information for three 24-hr
periods on non-consecutive days including one weekend day. Dietary recall information will be
obtained at approximately weeks 16 and 32 of gestation. This will permit assessment of
typical dietary intake of total calories and specific nutrients, including folate.
Blood samples will be collected, in the non-fasting state, at the first, 28 week and 36 week
prenatal visits and from the mother and cord blood at delivery for determination of primary
outcome measures.
Inclusion Criteria:
- Healthy women with singleton pregnancy
- < 10 weeks gestation at enrollment
- body mass index 18.5 - 35.0 kg/m2
- willingness to comply with study protocol ( i.e. take assigned daily prenatal vitamin;
complete diet recall and study questionnaire)
- not consuming super-fortified ready-to-eat cereal products (with > 100% RDA for folate
per serving)
Exclusion Criteria:
- BMI < 18.5 or > 35.0 kg/m2
- use of prescription drugs
- anemia
- chronic disease (diabetes, hypertension, epilepsy, cancer, kidney disease,
cardiovascular disease)
- acute illness (e.g. pneumonia, urinary tract infection, mononucleosis)
- use of antibiotics in past 2 weeks
- follows vegan dietary regime
- current smoker
- typical alcohol consumption of 2 or more drinks per day
- having undergone in vitro fertilization treatment
- carrying more than one fetus
- pregnancy-associated complications (i.e gestational diabetes, pre-eclampsia)
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