Researchers studied what happens to baby primates’ lungs when their mothers don’t eat enough food during pregnancy. They found that when pregnant baboons ate only 70% of the normal amount of food, their babies’ lungs developed differently. Specifically, the babies had fewer of the special cells that make a slippery substance called surfactant, which helps lungs work after birth. The babies also had fewer blood vessels in their lungs and weaker immune protection. These changes could make it harder for babies to breathe properly when they’re born. This research suggests that good nutrition during pregnancy is really important for healthy lung development.
The Quick Take
- What they studied: How eating less food during pregnancy affects the development of a baby’s lungs, specifically looking at whether babies can make enough of the slippery substance (surfactant) their lungs need to work after birth.
- Who participated: Pregnant baboons were split into two groups: one group ate a normal diet, while the other group ate only 70% of the normal amount of food (about 3 out of every 4 meals). Researchers studied the lungs of 16 baby baboons total (8 from each group) near the end of pregnancy.
- Key finding: Babies whose mothers ate less food had 30-40% fewer of the special lung cells that make surfactant, plus they had fewer blood vessels in their lungs and weaker immune cells. This suggests their lungs may not work as well when they’re born.
- What it means for you: This research suggests that pregnant people should eat enough nutritious food to help their babies’ lungs develop properly. If you’re pregnant or planning to become pregnant, talk to your doctor about proper nutrition. However, this study was done in primates, so we need more research in humans to be sure these findings apply to people.
The Research Details
Scientists used pregnant baboons because their pregnancy and lung development are very similar to humans. They divided the baboons into two groups: one group ate their normal diet, and the other group ate only 70% of the normal amount of food (like eating 3 meals instead of 4 every day). This reduced food amount continued throughout the entire pregnancy.
Near the end of pregnancy (at about 90% of the way through), the researchers collected lung tissue from the baby baboons and studied it in detail. They used two main tools: one technique that measures how much of certain genes were turned on or off, and another technique that let them see exactly where different types of cells were located in the lung tissue.
The researchers looked for specific markers of lung maturity, including the cells that make surfactant, blood vessels, and immune cells. This allowed them to compare how well the lungs developed in babies whose mothers ate normally versus those whose mothers ate less.
Using primates (baboons) is important because their bodies work very similarly to humans, especially during pregnancy and lung development. This makes the findings more relevant to people than if they had only studied mice or other animals. The timing of the study—looking at lungs near the end of pregnancy—is also important because this is when lungs are preparing to work after birth. By understanding how nutrition affects this critical development period, scientists can better understand what pregnant people need to eat for healthy babies.
This study has some strengths: it used a realistic animal model similar to humans, it measured multiple important lung features, and it had a clear comparison between two groups. However, the sample size was relatively small (only 16 baby baboons total), which means the results might not be as reliable as studies with more participants. The study was done in animals, not humans, so we can’t be completely sure these exact results would happen in people. The study was well-designed and published in a respected scientific journal, which suggests the methods were sound.
What the Results Show
The main finding was that babies whose mothers ate less food had fewer of the special cells (called type II alveolar epithelial cells) that make surfactant. Surfactant is like a natural lubricant that helps lungs expand and work properly after birth. Without enough of these cells, babies might struggle to breathe.
The researchers also found that the babies had lower levels of a specific gene (PCYT1A) that controls the production of surfactant. This gene is like an instruction manual for making the building blocks of surfactant. When this gene is less active, the body can’t make as much surfactant.
Additionally, babies exposed to maternal nutrient restriction had fewer blood vessels in their lungs. Blood vessels are important because they deliver oxygen from the lungs to the rest of the body. Fewer blood vessels means less oxygen can be picked up and delivered.
Finally, the babies had fewer immune cells in their lungs. These immune cells help fight infections, so having fewer of them might make newborns more vulnerable to respiratory infections.
Interestingly, the levels of surfactant proteins themselves weren’t significantly different between the two groups. This suggests that while the babies could still make some surfactant proteins, they had fewer of the cells to produce them and less of the genetic instruction to do so. This is an important distinction because it shows the problem isn’t that the body forgot how to make surfactant—it’s that there are fewer workers (cells) available to do the job.
Previous research has shown that poor nutrition during pregnancy can affect fetal development in many ways. This study adds to that knowledge by showing specific details about how it affects lung development. Earlier studies suggested that nutrition affects surfactant maturation, but this research provides more precise information about which cells and genes are affected. The findings align with what scientists already knew about how the body prioritizes nutrition during pregnancy—when food is limited, development of certain structures can be compromised.
This study was conducted in baboons, not humans, so we can’t be completely certain the same effects would occur in pregnant people. The sample size was small (only 16 babies), which means the results might not be as reliable as larger studies. The study only looked at one level of nutrient restriction (70% of normal), so we don’t know if eating slightly less food would have the same effect or if eating much less would be even worse. The study measured lung development at one point in time (near the end of pregnancy), so we don’t know exactly what happens to these babies after they’re born or if the effects get better or worse over time.
The Bottom Line
Based on this research, pregnant people should aim to eat a balanced, nutritious diet with adequate calories, protein, and essential nutrients. Talk to your healthcare provider about what a healthy diet looks like for your pregnancy. This study suggests that severe calorie restriction during pregnancy may harm fetal lung development, so it’s important to eat enough food. However, this doesn’t mean you need to ’eat for two’—just eat enough to support your health and your baby’s development. Confidence level: Moderate (this is animal research, but it aligns with other nutrition research in pregnancy).
This research is most relevant to pregnant people and those planning to become pregnant. It’s also important for healthcare providers who advise pregnant patients about nutrition. If you’re struggling to get enough food due to poverty, food insecurity, or other challenges, talk to your doctor or a nutritionist about resources that might help. This research doesn’t apply to people who aren’t pregnant, though good nutrition is important for everyone.
The effects shown in this study happened during pregnancy and would affect the baby at birth. If a pregnant person improves their nutrition now, it may help their baby’s lung development going forward. However, if poor nutrition has already occurred early in pregnancy, the damage may already be done. This is why consistent good nutrition throughout pregnancy is important, not just at the end.
Want to Apply This Research?
- If pregnant, track daily calorie and protein intake to ensure you’re meeting nutritional needs. Aim for the recommended daily calories for your trimester (typically 300-500 extra calories per day in the second and third trimesters) and adequate protein (about 70 grams per day). Log meals and note energy levels and any nutrition-related concerns.
- Use the app to set daily nutrition goals and receive reminders to eat balanced meals with protein, fruits, vegetables, and whole grains. Create a meal plan that ensures consistent, adequate nutrition throughout pregnancy. Set alerts for prenatal vitamin intake if recommended by your doctor.
- Track weekly weight gain (typically 0.5-1 pound per week in the second and third trimesters) and monitor how you feel. If you notice significant weight loss or struggle to meet calorie goals, flag this for discussion with your healthcare provider. Use the app to share nutrition data with your doctor at prenatal visits.
This research was conducted in primates and has not been directly tested in humans. While the findings suggest that adequate nutrition during pregnancy is important for fetal lung development, individual pregnancy needs vary. Pregnant people should consult with their healthcare provider or a registered dietitian about appropriate nutrition during pregnancy. This information is not a substitute for medical advice. If you have concerns about your nutrition during pregnancy or your baby’s health, contact your healthcare provider immediately. Do not restrict calories during pregnancy without medical supervision.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.