Researchers in Ethiopia studied 357 pregnant women with anemia (low iron in blood) who took iron and folic acid supplements. About half of the women showed good improvement in their blood iron levels after taking the supplements. However, the study found that several factors made it harder for some women to benefit from the pills, including intestinal parasites, not eating enough meat or vegetables, drinking too much coffee, and having certain infections. Understanding these barriers could help doctors better support pregnant women and reduce serious pregnancy complications.
The Quick Take
- What they studied: Whether pregnant women with low iron levels improved after taking iron and folic acid supplements, and what factors prevented some women from improving
- Who participated: 357 pregnant women with anemia (low blood iron) at a hospital in Ethiopia, studied between June and October 2023
- Key finding: About 53% of women showed good improvement in their blood iron levels after taking supplements. Women with intestinal parasites, poor diet, or certain infections were 2-4 times more likely to not improve
- What it means for you: Iron supplements work for many pregnant women, but doctors need to check for and treat other health issues like parasites and infections to help supplements work better. Better nutrition and lifestyle habits also matter significantly
The Research Details
This was a longitudinal follow-up study, which means researchers tracked the same group of pregnant women over time to see how their blood iron levels changed. The study took place at a hospital in Northwest Ethiopia from June to October 2023. Researchers randomly selected 357 pregnant women with anemia and gave them iron and folic acid supplements to take. They measured the women’s blood iron levels at the start and end of the study using a special machine that counts blood cells. The researchers also tested the women for intestinal parasites and infections like hepatitis and HIV using blood tests and stool samples. They collected information about the women’s diet, coffee drinking habits, where they lived, and how many children they had already given birth to.
This research approach is important because it shows real-world results in a specific population. By following women over time and measuring their actual blood iron levels, researchers could see which women improved and which didn’t. By also checking for parasites, infections, and diet, they could identify the actual reasons why some women didn’t respond well to the supplements. This helps doctors understand what else needs to be fixed besides just giving pills.
The study used proper scientific methods including random selection of participants, standardized blood testing equipment, and statistical analysis. The research was published in PLoS ONE, a well-respected scientific journal. However, the study was conducted in one hospital in Ethiopia, so results may not apply equally to all populations. The study didn’t have a comparison group that didn’t receive supplements, which would have strengthened the findings.
What the Results Show
The main finding was that about 53% of the pregnant women (188 out of 357) showed good improvement in their blood iron levels after taking iron and folic acid supplements. On average, women’s blood iron levels increased from 10.3 to 10.73 grams per deciliter, which is a meaningful improvement. However, this also means that 47% of women did not show adequate improvement despite taking the supplements regularly.
The study identified nine specific factors that made women less likely to respond well to the supplements. Women living in rural areas were 2.4 times more likely to have poor response compared to those in cities. Women who had intestinal parasites were 2.8 times more likely to not improve. Women who ate meat less than twice per week were 1.7 times more likely to have poor response, while those eating green vegetables and fruits less than twice per week were 2.5 times more likely to struggle.
Other important factors included drinking coffee regularly (1.9 times more likely to have poor response), having had multiple pregnancies before (2.9 times more likely), having hepatitis B or C infections (2.5 times more likely), and being in later stages of pregnancy (4 times more likely). The longer women had been taking supplements without improvement, the more likely they were to continue struggling.
The study found that the timing of when women started supplements mattered. Women who started supplements later in pregnancy had worse outcomes than those who started earlier. This suggests that starting iron supplementation early in pregnancy is important for better results. The research also showed that diet quality played a major role—women with poor eating habits had significantly worse outcomes than those with better nutrition. Living in rural versus urban areas was another important factor, possibly because rural women have less access to healthcare and nutritious food.
Previous research has shown that iron and folic acid supplements generally help pregnant women with anemia, but this study adds important details about why they don’t work for everyone. Earlier studies suggested parasites and poor nutrition could interfere with iron absorption, and this research confirms those findings in a real-world setting. The finding that about half of women respond well aligns with other studies showing variable effectiveness of supplementation programs in low-resource settings.
This study only included women at one hospital in Ethiopia, so results may not apply to pregnant women in other countries or settings. The study didn’t include a control group of women who didn’t take supplements, so we can’t be completely sure the supplements caused the improvement (though it’s very likely). The study didn’t measure whether women actually took their supplements as prescribed, which could affect the results. The research was conducted over just 5 months, so we don’t know about long-term outcomes. Finally, the study didn’t look at whether the improvements in blood iron levels actually led to better pregnancy outcomes for mothers and babies.
The Bottom Line
Pregnant women with anemia should take iron and folic acid supplements as prescribed by their doctor (moderate confidence). Before starting supplements, women should be tested for intestinal parasites and infections, which should be treated if found (moderate-to-high confidence). Pregnant women should eat meat, fish, eggs, green vegetables, and fruits at least twice per week to help iron supplements work better (moderate confidence). Pregnant women should limit coffee drinking, as it may interfere with iron absorption (moderate confidence). Women should start taking supplements early in pregnancy rather than waiting until later (moderate confidence).
This research is most relevant to pregnant women in low-resource settings like Ethiopia, but the findings apply broadly to all pregnant women with anemia. Healthcare providers, especially in rural areas, should pay attention to these findings to better support their pregnant patients. Public health officials should use this information to improve anemia prevention programs. Women planning to become pregnant should know that good nutrition and treating parasites before pregnancy can help prevent anemia. However, these findings are less relevant to women in wealthy countries with excellent healthcare and nutrition, where anemia is less common.
Blood iron levels typically begin to improve within 2-4 weeks of starting iron supplements if the supplements are working well. However, it may take 8-12 weeks to see full improvement. If a woman hasn’t seen improvement after 4-6 weeks of taking supplements regularly, she should see her doctor to check for parasites, infections, or other problems that might be interfering with the supplements’ effectiveness.
Want to Apply This Research?
- Track daily iron supplement intake (yes/no), weekly meat consumption (number of times per week), weekly green vegetable and fruit consumption (number of times per week), and coffee cups per day. Also note any gastrointestinal symptoms that might indicate parasites.
- Users can set reminders to take iron supplements at the same time each day with food (but not with coffee). The app could suggest simple, affordable iron-rich meals based on local foods available in their area. Users could track their weekly vegetable and meat intake with a goal of at least 2 times per week for each. The app could provide education about which foods help iron absorption and which foods or drinks (like coffee) interfere with it.
- Track supplement adherence weekly and dietary habits weekly. Encourage users to get blood iron levels checked every 4-6 weeks during pregnancy. If improvement isn’t seen after 6 weeks, prompt users to consult their healthcare provider about testing for parasites and infections. Monitor for symptoms like unusual fatigue, shortness of breath, or pale skin that might indicate worsening anemia.
This research describes findings from a specific study in Ethiopia and should not replace personalized medical advice from your healthcare provider. Pregnant women should always consult with their doctor or midwife before starting, stopping, or changing any supplements or medications. If you are pregnant and have been diagnosed with anemia, work with your healthcare team to develop a treatment plan tailored to your individual health needs. This information is educational and is not intended to diagnose, treat, cure, or prevent any disease. Results from this study may not apply equally to all populations and settings.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.