A Gram Research analysis of a 10-month Finnish study found that preschoolers eating plant-forward school meals showed accelerated bone turnover—with bone-building markers increasing by 0.05 log-U/L and bone-breakdown markers rising by 2.12 U/L—yet maintained adequate calcium, vitamin D, and protein intake. While nutrient levels remained sufficient, researchers emphasize that the clinical significance of faster bone turnover in young children requires further investigation to ensure long-term bone health isn’t compromised by the shift to plant-based meals.
Researchers in Finland tested whether switching school meals to be more plant-based affects how children’s bones grow and change. Over 10 months, some preschools served more plant-based foods and less red meat, while others kept regular meals. Kids eating the plant-forward meals showed faster bone turnover—meaning their bones were breaking down and rebuilding at a quicker rate. However, the study found no problems with how much calcium, vitamin D, or protein the children were getting. Scientists say more research is needed to understand if this faster bone turnover is actually good or bad for children’s long-term bone health.
Key Statistics
A 10-month cluster-randomized trial of 46 Finnish preschoolers found that children eating plant-forward school meals had significantly higher bone-specific alkaline phosphatase levels (0.05 log-U/L increase, p=0.04) compared to those eating regular meals, indicating accelerated bone formation.
According to research reviewed by Gram, preschoolers on plant-forward meals showed increased bone resorption markers (S-TRAP5b increased 2.12 U/L, p=0.02), yet maintained adequate vitamin D concentrations (≥50 nmol/L) and no differences in calcium, vitamin D, phosphorus, or protein intake compared to control groups.
A 2026 Finnish study of 46 children ages 3-5 found that plant-forward school meals produced faster bone turnover without causing nutrient deficiencies, though researchers noted the clinical relevance of accelerated bone turnover in young children remains unclear and requires further investigation.
The Quick Take
- What they studied: Whether switching preschool meals to include more plant-based foods and less meat affects how children’s bones develop and what nutrients they eat
- Who participated: 46 children ages 3-5 from Finnish preschools (18 in the plant-forward meal group, 28 in the regular meal group) who provided blood samples and food records
- Key finding: Children eating plant-forward meals showed increased bone turnover markers—meaning their bones were breaking down and rebuilding faster—but they were still getting enough calcium, vitamin D, and protein
- What it means for you: Plant-based school meals don’t seem to cause nutrient deficiencies in young children, but the faster bone changes need more study to understand if they’re helpful or concerning for growing bones
The Research Details
This was a cluster-randomized controlled trial, which is a strong type of study design. Researchers randomly assigned 23 Finnish preschools to either serve plant-forward meals (more vegetables, beans, and plant proteins; less red meat; less milk) or continue regular meals for 10 months. The key word “cluster” means entire schools were assigned to one group or the other, rather than individual children, which is more realistic for school settings.
The researchers measured bone health using blood tests that show whether bones are building up or breaking down. They also tracked what the children ate using food frequency questionnaires—basically asking parents what foods their kids ate regularly. Only 46 children (18 from the plant-forward group and 28 from the regular group) completed the full study with blood samples at the start and end.
This design is strong because it tests real-world conditions in actual schools rather than in a lab. However, the small number of children who completed the study is a limitation that affects how confident we can be in the results.
As more people shift toward plant-based eating for health and environmental reasons, we need to understand how this affects children’s growing bodies. Bones are especially important during childhood because that’s when they’re developing and getting stronger. This study helps answer the question: Can kids get everything they need for healthy bones on plant-forward diets?
This study has several strengths: it was randomized (reducing bias), it measured actual blood markers of bone health (not just guesses), and it was conducted in real school settings. However, the study is limited by its small sample size of children who completed it, its relatively short 10-month duration, and the fact that it only measured bone turnover markers rather than actual bone strength. The results suggest further research is needed before drawing firm conclusions.
What the Results Show
Children eating plant-forward meals showed three important changes in their blood markers related to bone health. First, they had higher levels of bone-specific alkaline phosphatase (S-BAP), which indicates bones are building new material. Second, they had higher levels of tartrate-resistant acid phosphatase 5b (S-TRAP5b), which shows bones are breaking down old material. Third, they had higher total alkaline phosphatase (S-ALP). Together, these results suggest that the plant-forward meals caused the children’s bones to turn over faster—meaning bones were remodeling at a quicker pace.
Interestingly, this faster bone turnover happened without any negative effects on the children’s nutrition. The study found no differences between groups in how much calcium, vitamin D, phosphorus, or protein the children were eating. Both groups had adequate vitamin D levels in their blood (at least 50 nmol/L, which is considered healthy). This suggests that the plant-forward meals were still providing enough of these important bone-building nutrients.
The researchers did not find changes in other bone health markers like parathyroid hormone, which helps regulate calcium in the body. This suggests the faster bone turnover wasn’t caused by problems with calcium regulation.
The study found that vitamin D levels were adequate in both groups, which is important because vitamin D is crucial for bone health and calcium absorption. The fact that children on plant-forward diets maintained adequate vitamin D suggests that either the school meals included enough vitamin D sources, or the children were getting it from sun exposure and other sources. No other significant differences were found in blood markers between the two groups.
Previous research has raised concerns that plant-based diets might not provide enough calcium, vitamin D, and protein for growing children. This study adds important information by showing that well-planned plant-forward school meals can meet children’s nutritional needs for these key bone-building nutrients. However, the finding of accelerated bone turnover is new and hasn’t been thoroughly studied in children before, so it’s unclear whether this is beneficial or potentially concerning.
The biggest limitation is that only 46 children completed the study with full blood samples—much smaller than the original 116 children enrolled. This small number makes it harder to be confident in the results. The study only lasted 10 months, which is relatively short for measuring bone health changes in growing children. The study measured bone turnover markers in blood but didn’t measure actual bone strength or density, so we don’t know if the faster turnover translates to stronger or weaker bones. Finally, the study relied on parents reporting what their children ate, which can be inaccurate.
The Bottom Line
Based on this research, plant-forward meals appear safe for preschool-aged children when planned to include adequate calcium, vitamin D, and protein. However, confidence in this recommendation is moderate because the study was small and short-term. Parents and schools should ensure plant-based meals include calcium-fortified plant milks, leafy greens, beans, nuts, and seeds. More research is needed before making strong claims about long-term bone health effects.
Parents considering plant-based diets for their young children, preschool and school administrators planning menus, and nutrition professionals designing child meal programs should pay attention to these findings. Children with existing bone health concerns should consult their doctor before major dietary changes. This research is less relevant for families already eating omnivorous diets unless they’re considering a shift.
Bone turnover changes happened within 10 months, but actual effects on bone strength would take longer to appear—likely years. Parents shouldn’t expect to see obvious changes in their child’s bones or growth in the short term. Long-term monitoring over several years would be needed to understand if faster bone turnover affects overall bone health.
Frequently Asked Questions
Are plant-based school meals safe for young children’s bone development?
Plant-forward school meals appear safe when they include adequate calcium, vitamin D, and protein sources. A 2026 study found preschoolers on plant-based meals maintained sufficient nutrient intake and healthy vitamin D levels, though faster bone turnover was observed and requires further study.
Do plant-based diets provide enough calcium and vitamin D for growing kids?
Yes, according to a 10-month Finnish trial, children eating plant-forward meals got adequate calcium, vitamin D, phosphorus, and protein. The key is including fortified plant milks, leafy greens, beans, nuts, seeds, and supplements to meet daily requirements.
What does accelerated bone turnover mean for children’s long-term bone health?
Accelerated bone turnover means bones are breaking down and rebuilding faster. The 2026 study found this occurred in children on plant-forward meals, but researchers emphasize the long-term health implications are unclear and need more research before drawing conclusions.
How can I make sure my child gets enough nutrients on a plant-based diet?
Include calcium-fortified plant milks (1-2 servings daily), leafy greens, beans, lentils, nuts, seeds, and consider vitamin D supplements or fortified foods. Track intake to ensure 700-1000mg calcium and 600 IU vitamin D daily depending on age, and consult a pediatric dietitian.
Should I be concerned about my child’s bones if we switch to plant-based meals?
A well-planned plant-based diet can support healthy bone development in children. However, ensure adequate calcium, vitamin D, and protein intake. The 2026 study showed nutrient adequacy was maintained, though longer-term research on bone health effects is still needed.
Want to Apply This Research?
- Track daily calcium and vitamin D intake in milligrams and IU respectively. Set a goal of 700mg calcium and 600 IU vitamin D daily for ages 1-3, or 1000mg calcium and 600 IU vitamin D for ages 4-8. Log sources: fortified plant milks, leafy greens, beans, nuts, seeds, and supplements.
- If shifting to plant-forward meals, use the app to identify and log calcium and vitamin D sources at each meal. Create a checklist of plant-based calcium sources (fortified soy milk, tofu, tahini, kale) and vitamin D sources (fortified cereals, mushrooms, supplements) to ensure variety and adequacy.
- Weekly review of nutrient totals to ensure targets are met. Monthly photos of meal plates to track meal composition. Quarterly check-ins with a pediatrician or dietitian to monitor growth and development. If using plant-based diets long-term, annual blood tests to verify vitamin D and other nutrient levels.
This research describes changes in bone turnover markers in a small group of Finnish preschoolers over 10 months. The clinical significance of these bone changes for long-term bone health is not yet established. Parents considering plant-based diets for young children should consult with their pediatrician or a registered dietitian to ensure adequate nutrition. This article is for educational purposes and should not replace professional medical advice. Individual children may respond differently to dietary changes based on genetics, activity level, sun exposure, and other factors.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.