Calcium Crisis: Are You Getting Enough During Pregnancy?
"New research spotlights a global nutritional gap, revealing that pregnant women, especially in low-income countries, aren't consuming sufficient calcium for their health and their babies' development. Learn how to bridge the calcium divide."
Pregnancy is a period of increased nutritional needs, and calcium is a critical player. Adequate calcium intake helps reduce the risk of hypertensive disorders during pregnancy, a leading cause of maternal deaths globally. Yet, a recent systematic review and meta-analysis reveals a concerning reality: many pregnant women, particularly those in low- and middle-income countries (LMICs), aren't getting enough calcium through their diets.
The study, published in the BJOG: An International Journal of Obstetrics and Gynaecology, paints a stark picture of global inequities in dietary calcium intake. Researchers analyzed data from 105 studies encompassing nearly 74,000 women across 37 countries. Their findings highlight a significant gap between calcium intake in high-income countries (HICs) and LMICs, raising serious concerns about maternal and child health outcomes.
This article breaks down the key findings of this important research, explores the reasons behind these calcium disparities, and provides actionable strategies to ensure pregnant women everywhere receive the calcium they need for a healthy pregnancy.
Advice and Supplementation
In the Netherlands, pregnant women may have ample access to affordable calcium-rich foods and supplements, yet calcium intake during pregnancy is still reported as inadequate. Most women in the cited study said they had received calcium advice and understood why intake should increase, showing that advice and access do not necessarily ensure adequate intake. A 2017 WHO recommendation on calcium supplementation was prioritized for updating in response to potentially important new evidence. A 2025 systematic review concludes that supplementation may benefit maternal and neonatal health, particularly where dietary calcium is insufficient or hypertensive-disorder risk is high, and says daily dose may vary with individual needs and dietary intake.
Changing Views of Calcium and Pregnancy
Pregnancy dietary advice has changed markedly: Slemons and Fagan wrote in 1927 that pregnant women should drink generously, but also recommended eliminating milk after quickening. A later longitudinal study followed 14 well-nourished women consuming approximately 1200 mg of calcium per day, with measurements before conception, during each trimester, and in early lactation. The study was designed to examine how the intestine, kidney, and bone help maintain calcium homeostasis across pregnancy and lactation. An evolutionary account describes humans as having developed in a high-calcium nutritional environment and says end-of-Stone-Age exercise and dietary patterns can serve as natural paradigms.
The Calcium Divide: A Global Snapshot
The meta-analysis revealed a clear disparity in calcium intake between HICs and LMICs. The average daily calcium intake in HICs was 948.3 mg, while in LMICs, it plummeted to just 647.6 mg. That's a difference of roughly 300mg/day. While specific recommendations vary, most guidelines suggest pregnant women consume at least 1000 mg of calcium daily, with some advising as much as 1300 mg.
- In HICs, 29% of countries reported calcium intakes below 800 mg/day.
- In LMICs, a staggering 82% of countries reported intakes below this critical threshold.
Recent Evidence on Intake and Outcomes
A 2019 report cited in a 2025 systematic review found that 27% of women in high-income countries consumed insufficient calcium during pregnancy. An umbrella review of systematic reviews and meta-analyses reports that many prior studies and reviews affirmed a role for calcium supplementation in preventing preeclampsia. Another umbrella review reported a 33% reduction in preeclampsia risk among low-risk pregnant women receiving calcium supplementation (RR 0.67, 95% CI 0.59–0.77). Two studies included in the 2025 clinical review also found that supplementation may increase bone mineral density and improve postpartum bone recovery, potentially reducing long-term osteoporosis risk.
Gaps in Guidance and Evidence
Calcium intake estimates in the global systematic review varied across studies whose sample sizes ranged from nine to 32,653 pregnant women. This wide range describes the scale of the underlying evidence base, but the provided source excerpt does not specify a single global intake estimate. Calcium supplementation is not routinely advised to pregnant women in most countries, according to the cited article. Its authors set out to predict the effect of advising 1,000 mg per day on pre-eclampsia cases prevented and related health-care costs.
Global Intake and Dairy-Free Options
A global review updated an earlier 2005 assessment of calcium intake in pregnancy, which had covered studies published from 1991 through July 2004; the update examined studies from 2004 onward. For people avoiding dairy, the supplied source describes fortified plant milks, collard greens, calcium-set tofu, and canned fish with edible bones as calcium-containing alternatives. A separate source emphasizes ensuring sufficient calcium through alternatives when dairy is excluded, to support maternal health and the developing baby. The available snippets do not provide comparable calcium amounts for these foods, so they do not establish which option supplies the most calcium.
Closing the Calcium Gap: A Call to Action
This research delivers a clear message: the calcium gap during pregnancy is a pressing global health issue, particularly affecting women in LMICs. While the study's limitations include the non-representative nature of some included studies and variability in data collection methods, the overall trend is undeniable.
A Cameroon Research Update
A 2023 article on calcium supplementation in pregnancy is described as an update to a research protocol titled “Hypocalcaemia and calcium intake in pregnancy: A research protocol for critical analysis of risk factors, maternofoetal outcomes and evaluation of diagnostic methods in a third-category health facility, Cameroon.” The source identifies the protocol as appearing in volume 15 under the identifier e0241812. The supplied description does not state the updated article’s findings or conclusions, so no clinical outcome can be drawn from it here.
Tailoring Supplementation to Need
A global review set out to assess calcium intake during pregnancy worldwide from 2004 onward, updating a 2005 review of studies published from 1991 to July 2004. A 2025 systematic review concludes that calcium supplementation may benefit maternal and neonatal health, especially in populations with insufficient dietary calcium and women at high risk of hypertensive disorders. That review says the daily dose may vary according to individual needs, dietary calcium intake, and general health status. Together, these sources frame both dietary inadequacy and variation in individual circumstances as relevant to pregnancy calcium strategies.
Why Calcium Advice Matters
The World Health Organization has recommended calcium supplementation during pregnancy since 2011 to reduce preeclampsia risk in populations with low dietary calcium intake. A 2025 systematic review describes potential complications associated with calcium deficiency during gestation, including gestational hypertension, preeclampsia, loss of bone mineral density, impaired fetal development, and other adverse pregnancy outcomes. That review’s stated aim is to evaluate current clinical evidence on calcium intake during pregnancy. The provided excerpt lists potential concerns but does not quantify how often they occur.
So, what can be done? The researchers suggest that, in the absence of specific local data, universal calcium supplementation for pregnant women in LMICs should be considered. Supplementation, while effective, presents challenges in terms of cost, logistics, and adherence. They also point to food fortification as a potential long-term strategy, but emphasize the need for careful planning and intake simulations to avoid excessive calcium consumption in any population group.
Ultimately, addressing this calcium crisis requires a multi-pronged approach involving governments, healthcare providers, and communities. By raising awareness, improving access to calcium-rich foods and supplements, and exploring sustainable fortification strategies, we can work towards ensuring that all pregnant women, regardless of where they live, receive the calcium they need for a healthy pregnancy and a healthy start for their children.