What is the relationship between dietary patterns consumed during pregnancy and birth weight standardized for gestational age and sex?
Approach to Answering the Question
Existing NESR Systematic Review
Pregnancy and Lactation Subcommittee
Existing Systematic Review Protocol
Developed for each scientific question being examined, the protocol describes the plan for how the systematic review will be conducted. For this question, the existing NESR systematic review was conducted during the Pregnancy and Birth to 24 Months Project, and captured evidence published from January 1980 to January 2017. The Pregnancy Technical Expert Collaborative conducted the systematic reviews in collaboration with staff from USDA’s Nutrition Evidence Systematic Review (NESR). Complete documentation of the existing systematic review and the related publication in the American Journal of Clinical Nutrition is available on the NESR website:
Draft Conclusion Statement
The draft conclusion statements listed below describe the state of the science related to the specific question examined. Draft conclusions are not considered final until they have been deliberated with and decided upon by the full Committee and published in the Committee’s final advisory report. Individual conclusion statements should not be interpreted as dietary guidance or the Committee’s overarching advice to the Departments.
No conclusion can be drawn on the association between dietary patterns during pregnancy and birth weight outcomes. Although research is available, the ability to draw a conclusion is restricted by inconsistency in study findings, inadequate adjustment of birth weight for gestational age and sex, and variation in study design, dietary assessment methodology, and adjustment of key confounding factors. Grade: Grade Not Assignable
Insufficient evidence exists to estimate the association between dietary patterns before pregnancy and birth weight outcomes. There are not enough studies available to answer this question. Grade: Grade Not Assignable