A randomized controlled trial of 114 children found that those whose mothers followed high-protein, low-sugar diets during pregnancy had higher cholesterol levels at age 9, with LDL cholesterol 0.24 mmol/L higher and total cholesterol 0.30 mmol/L higher than children whose mothers ate balanced diets. According to Gram Research analysis, the cholesterol gap widened as children aged, suggesting long-term effects from pregnancy nutrition choices.
A new study followed children born to pregnant women who ate high-protein, low-sugar diets and compared them to children whose mothers ate moderate amounts of protein and carbs. At age 9, kids whose mothers followed the high-protein diet had higher cholesterol levels, particularly LDL (the “bad” cholesterol). Interestingly, the difference got bigger as kids got older. The study included 114 children and found no major differences in weight or blood sugar control. Gram Research analysis suggests that what pregnant women eat may have lasting effects on their children’s heart health, though researchers say more studies are needed to understand why this happens.
Key Statistics
A randomized controlled trial of 114 children published in the European Journal of Nutrition in 2026 found that offspring of mothers who followed high-protein, low-glycemic-index diets during pregnancy had 0.30 mmol/L higher total cholesterol at age 9 compared to children whose mothers ate moderate-protein diets.
The same 2026 study of 114 children found LDL cholesterol (bad cholesterol) was 0.24 mmol/L higher in children whose mothers ate high-protein diets during pregnancy, with the difference increasing as children aged from birth to 9 years.
According to a 2026 randomized controlled trial following 114 children, bone mineral density was 0.03 g/cm² higher in offspring of mothers on high-protein pregnancy diets, though this small benefit did not offset concerns about elevated cholesterol.
A 2026 study of 114 children found that glucose control and body fat composition showed no significant differences between offspring of mothers on high-protein versus moderate-protein pregnancy diets, suggesting the dietary effect was specific to cholesterol.
The Quick Take
- What they studied: Whether eating a high-protein, low-sugar diet during pregnancy affects how healthy children’s cholesterol levels are at age 9
- Who participated: 114 children (average age 9) whose mothers were overweight or obese during pregnancy. Half had mothers on a high-protein diet, half had mothers on a regular diet.
- Key finding: Children whose mothers ate high-protein diets had cholesterol levels about 0.30 mmol/L higher and LDL cholesterol 0.24 mmol/L higher than children whose mothers ate moderate-protein diets. The gap widened as children got older.
- What it means for you: If you’re pregnant or planning to be, this suggests very high-protein diets might not be ideal, especially if you’re overweight. Talk to your doctor about the best diet for your situation. This is one study, so don’t make major changes based on this alone.
The Research Details
Researchers randomly assigned pregnant women who were overweight or obese to two different eating plans. One group ate a high-protein, low-sugar diet (designed to be healthier for weight management). The other group ate a moderate-protein, moderate-carb diet (a more balanced approach). The women followed these diets during pregnancy. Then, when their children turned 9 years old, researchers measured the kids’ cholesterol, blood sugar, body fat, and bone density.
The study was careful and scientific. Researchers took blood samples after the children fasted overnight (hadn’t eaten for 12+ hours), which gives the most accurate cholesterol readings. They also used advanced technology like special X-ray scans and MRI machines to measure body composition precisely. Some children even wore glucose monitors for up to two weeks to track blood sugar patterns.
This type of study (called a randomized controlled trial) is considered very reliable because researchers randomly assigned people to groups, which helps eliminate bias. However, only 114 of the original 208 children were followed up at age 9, which means some families dropped out of the study.
Understanding how pregnancy diet affects children’s long-term health is crucial because what happens in the womb can have lasting effects. If high-protein diets during pregnancy truly raise cholesterol in children, doctors need to know this to give better advice to pregnant women. This is especially important for overweight or obese pregnant women, who are often told to eat more protein.
This study has several strengths: it was randomized (reducing bias), used precise measurement tools, and followed children for 9 years. However, it has limitations: only about 55% of the original children were measured at age 9 (the rest dropped out), the sample size is relatively small, and it only included overweight or obese mothers, so results may not apply to all pregnant women. The study was published in a respected journal (European Journal of Nutrition), which suggests it passed expert review.
What the Results Show
The main finding was clear: children whose mothers ate high-protein, low-sugar diets had higher cholesterol levels at age 9. Total cholesterol was 0.30 mmol/L higher (this is a small but measurable difference), and LDL cholesterol (the “bad” kind) was 0.24 mmol/L higher. These differences were statistically significant, meaning they’re unlikely to be due to chance.
Interestingly, the researchers found that the cholesterol gap between the two groups grew larger as children got older. This suggests the effect of the mother’s pregnancy diet doesn’t show up immediately but builds over time. At birth, the differences were smaller, but by age 9, they were more noticeable.
One surprising finding was that bone mineral density (bone strength) was slightly higher in children whose mothers ate the high-protein diet. While this might sound good, it was only a small difference (0.03 g/cm²), and researchers didn’t emphasize this as a major benefit.
Other measurements didn’t show important differences. Blood sugar control (glucose homeostasis) was similar between groups, and the amount of fat tissue children had was also similar. This means the high-protein diet didn’t make kids fatter or thinner, and it didn’t affect their blood sugar regulation.
The study tracked glucose (blood sugar) patterns using continuous monitors for up to 14 days. Despite the high-protein diet during pregnancy, children’s blood sugar control appeared normal and similar between groups. Body composition (the ratio of muscle to fat) measured by advanced imaging also showed no significant differences. These findings suggest the high-protein diet’s main effect was on cholesterol, not on weight or blood sugar.
This study adds important new information to existing research. Previous studies have shown that high-protein diets can help with weight management during pregnancy, which is why doctors sometimes recommend them for overweight pregnant women. However, most previous research focused on the mother’s health, not the baby’s long-term health. This study is one of the first to show that these diets might have unexpected effects on children’s cholesterol years later. The findings suggest we need to be more careful about recommending very high-protein diets during pregnancy without understanding all the long-term effects.
Several limitations affect how much we can trust these results. First, only 55% of the original 208 children were measured at age 9—the other 45% were lost to follow-up. This means the final group might not represent all the original children. Second, the study only included overweight and obese pregnant women, so we don’t know if these results apply to normal-weight women. Third, the differences in cholesterol, while real, are relatively small in absolute terms. Fourth, researchers didn’t measure cholesterol at birth or at other ages between birth and 9 years, so we can’t see exactly when the differences started. Finally, the study couldn’t determine why the high-protein diet affected cholesterol—the mechanism remains unknown.
The Bottom Line
Based on this study, pregnant women (especially those who are overweight or obese) should be cautious about very high-protein, low-carb diets. Instead, work with a doctor or registered dietitian to find a balanced eating plan that supports healthy weight management without potentially harming the baby’s future cholesterol levels. This recommendation has moderate confidence because it’s based on one study, though it’s a well-designed one. Don’t make drastic diet changes based on this study alone—discuss with your healthcare provider.
This research is most relevant to pregnant women who are overweight or obese, since that’s who was studied. It’s also important for doctors and dietitians who advise pregnant women about nutrition. Women of normal weight may not need to worry as much, though the findings suggest caution with extreme high-protein diets for anyone. If you’re not pregnant but planning to be, this is worth discussing with your doctor.
The effects observed in this study took 9 years to fully develop. The cholesterol differences were small at birth but grew larger over childhood. This means any changes to diet during pregnancy would take years to show their full effects on a child’s health. Don’t expect to see results in weeks or months—this is about long-term health.
Frequently Asked Questions
Does eating high-protein during pregnancy affect my child’s cholesterol later?
Research shows children whose mothers ate high-protein diets during pregnancy had higher LDL cholesterol at age 9 (0.24 mmol/L higher). The effect grew larger as children aged, suggesting long-term impacts. Discuss balanced nutrition with your doctor rather than extreme diets.
Should I avoid high-protein diets if I’m pregnant and overweight?
This study suggests caution with very high-protein diets during pregnancy, especially for overweight women. Work with a registered dietitian to find a balanced approach that supports healthy weight without potentially raising your child’s future cholesterol risk.
When do the effects of pregnancy diet show up in children?
This study found cholesterol differences were small at birth but became more noticeable by age 9. The effects developed gradually over childhood, suggesting pregnancy nutrition has long-term impacts that take years to fully appear.
Does high-protein pregnancy diet affect a child’s weight or blood sugar?
No significant differences were found in body fat or glucose control at age 9 between children whose mothers ate high-protein versus moderate-protein diets. The main effect observed was on cholesterol levels specifically.
Can I trust these results for all pregnant women?
This study only included overweight and obese pregnant women, so results may not apply to normal-weight women. Additionally, only 55% of original participants completed the 9-year follow-up. Discuss your individual situation with your healthcare provider.
Want to Apply This Research?
- If you’re pregnant or planning pregnancy, track your daily protein intake (grams per day) and carbohydrate sources alongside any cholesterol or metabolic health markers. Set a target range based on your doctor’s recommendation rather than going to extremes.
- Instead of focusing on “high-protein” or “low-carb,” aim for balanced meals with moderate protein (about 25-30% of calories), whole grains, fruits, vegetables, and healthy fats. Log meals to ensure variety rather than extremes.
- For pregnant women: track protein intake weekly and discuss with your healthcare provider. For parents of young children: if your child had a mother on a high-protein pregnancy diet, consider having cholesterol checked at age 9-10 as a baseline, then monitor every 2-3 years during childhood.
This research describes associations found in one study and should not replace personalized medical advice. Pregnant women should consult with their obstetrician or registered dietitian before making significant dietary changes. This study was conducted in overweight and obese women and may not apply to all populations. Cholesterol levels should be interpreted by a healthcare provider in the context of individual health history. If you have concerns about your pregnancy diet or your child’s cholesterol, speak with your doctor rather than making changes based on this study alone.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.