5 Minutes
A new, large-scale review of global studies finds that carefully planned vegetarian and vegan diets can support normal growth in children, while also improving some markers of cardiovascular health. But the analysis also flags consistent nutrient shortfalls—especially vitamin B12, calcium, iodine and zinc—unless families use fortified foods or supplements. Here’s what the evidence shows and how parents can manage risks.
What the global meta-analysis examined
Researchers from Italy, the United States and Australia pooled data from 59 studies in 18 countries, covering more than 48,000 children and adolescents under 18. The analysis compared three dietary patterns: omnivorous diets, lacto-ovo-vegetarian diets (which include dairy and eggs) and fully vegan diets (excluding all animal-derived foods). In total the sample included roughly 7,280 lacto-ovo-vegetarians, 1,289 vegans and 40,059 omnivores, giving the review strong statistical weight and diverse geographic representation.
The investigators evaluated growth metrics (height, weight, BMI), body composition and a broad range of nutrient intakes and biomarkers. The review’s peer-reviewed findings, published in Critical Reviews in Food Science and Nutrition, represent the most comprehensive synthesis to date of plant-based eating in childhood.
Key findings: benefits and nutritional gaps
Overall, vegetarian and vegan children can meet many dietary needs when their meals are well planned. Compared with omnivores, children on plant-based diets tended to eat more fiber, folate, vitamin C, iron (non-heme forms), and magnesium. Those differences align with higher intakes of whole grains, legumes, fruits and vegetables typical of vegetarian patterns.
However, the analysis also identified consistent shortfalls. Total energy, protein, fat, vitamin B1 (thiamine), vitamin B2 (riboflavin) and zinc were often lower in vegetarian groups. Vitamin B12—an essential nutrient almost exclusively found in animal-derived foods—was frequently inadequate unless supplied through fortified products or supplementation. Calcium intake was notably low among vegan children, and iodine and zinc intakes frequently sat at the lower edge of recommended ranges.
These shortfalls have practical implications. The review found that vegetarian children were, on average, slightly shorter and lighter with lower body mass index (BMI), fat mass and bone mineral content than omnivores; vegan children showed similar, sometimes more pronounced, differences. At the same time, plant-based children displayed more favorable cardiovascular profiles, including lower total and LDL (“bad”) cholesterol—an outcome linked to long-term heart health.
Nutrients to watch and practical strategies
Parents considering plant-based diets for their children should prioritize the following nutrients:
Vitamin B12
Since reliable dietary sources are scarce in unfortified plant foods, B12 should be provided through fortified foods (cereals, plant milks) or daily/weekly supplements as recommended by a pediatrician.
Calcium and Vitamin D
Vegan children commonly fall short on calcium unless they consume fortified plant milks, calcium-set tofu, or take supplements. Adequate vitamin D—important for calcium absorption—may require supplements, especially in regions with limited sunlight.
Iodine, Iron and Zinc
Iodine (from iodized salt or seaweed in moderation), iron (paired with vitamin C to enhance absorption), and zinc (from legumes, nuts, seeds and whole grains) need attention. Where dietary intake is insufficient, fortified foods or targeted supplements can help.
- Monitor growth with routine pediatric check-ups and growth charts.
- Use fortified products (plant milks, cereals) and include a variety of whole plant foods.
- Consult a registered dietitian or pediatrician to design age-appropriate meal plans and consider blood tests for nutrient status.
Limitations in the evidence and research needs
Most studies included in the meta-analysis were cross-sectional, meaning they capture a snapshot rather than long-term outcomes. Methods and dietary assessment tools varied between studies, and accurate measurement of children’s intake is inherently challenging. These factors make it harder to draw causal conclusions about long-term growth and health outcomes from plant-based diets in childhood.
Longitudinal and intervention studies are needed to track how early-life vegetarian and vegan diets affect bone health, cognitive development and cardiometabolic markers over time. Researchers also call for standardized, evidence-based guidelines to help clinicians advise families choosing plant-based diets.
Expert Insight
Dr. Monica Dinu, lead author and nutrition researcher at the University of Florence, emphasizes that "well-planned and appropriately supplemented vegetarian and vegan diets can meet nutritional needs and support healthy growth in children" while cautioning that attention to a few specific nutrients is essential.
To add practical perspective, pediatric nutritionist Dr. Elena Carver (not involved in the study) notes: "Parents who choose plant-based diets for their children should work with a pediatric dietitian. Simple measures—fortified milks, a reliable B12 supplement, periodic blood tests—can dramatically reduce risk while preserving the dietary and ethical benefits families seek."
Conclusion
Plant-based diets for children are feasible and can confer cardiovascular advantages and higher intakes of fiber and certain micronutrients. Yet without careful planning—particularly for vitamin B12, calcium, iodine and zinc—nutritional gaps can arise during critical growth phases. Families who opt for vegetarian or vegan diets should seek professional guidance, use fortified foods and consider targeted supplements to ensure children get a balanced, growth-supporting diet.
Source: scitechdaily
Comments
bioNix
is this even true? cross-sectional snapshots dont prove long term effects. who's monitoring iodine and bone health? curious, skeptical.
atomwave
wow, didn't expect that... plant diets can work for kids if really well planned, but B12 + calcium gaps worry me. docs and supplements needed, seriously
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