Maternal calcium supplementation and fetal bone mineralization

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Nutritional Science

Background:

• Fetal bone development is crucial for long-term skeletal health.
• Maternal nutrition significantly impacts fetal growth and mineralization.
• Calcium intake during pregnancy is essential for adequate fetal skeletal development.

Purpose of the Study:

• To investigate the impact of maternal calcium supplementation on fetal bone mineralization.
• To assess if calcium supplementation benefits fetuses of mothers with varying dietary calcium intakes.
• To determine optimal calcium intake strategies during pregnancy for fetal skeletal health.

Main Methods:

• A double-masked, randomized controlled trial involving healthy pregnant women before 22 weeks' gestation.
• Participants received either 2 g/day of elemental calcium or a placebo until delivery.
• Neonatal bone mineralization was assessed using dual-energy x-ray absorptiometry (DXA) in the first week of life.

Main Results:

• No significant differences in neonatal bone mineral content were observed between groups overall.
• Maternal calcium supplementation significantly increased fetal total body bone mineral content in the lowest quintile of dietary calcium intake (<600 mg/day).
• The positive effect of calcium supplementation remained significant after adjusting for maternal factors and normalizing for infant size.

Conclusions:

• Maternal calcium supplementation (up to 2 g/day) during the second and third trimesters enhances fetal bone mineralization in women with low dietary calcium intake.
• Supplementation is unlikely to yield substantial benefits for fetal bone mineralization in pregnant women with adequate dietary calcium intake.
• Targeted calcium supplementation may be beneficial for specific maternal nutritional profiles.