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Gastrointestinal Motility and Disorders · Review
Pediatric Research · September 8, 2026
Encouraging direction, but not yet definitive.
This systematic review of 8 pediatric dietary intervention trials (200 children, 6–16 years) found that balanced calorie-restricted diets significantly increased gut microbiota alpha-diversity (Chao1 index) and expanded butyrate-producing bacteria. However, substantial heterogeneity, limited pooled data (only 4 studies for meta-analysis), and absence of clearly demonstrated cardiometabolic benefit limit the strength of evidence and clinical translation.
Systematic review and meta-analysis of randomized and non-randomized intervention trials. Children and adolescents aged 6–16 years with overweight or obesity enrolled in clinical trials of dietary interventions.. Intervention: Dietary interventions: six studies used calorie-restricted diets, one used a low free-sugar diet, and one used the CHILD-1 diet.. n = 200.
Meta-analysis showed significant increase in Chao1 index of 48.76 [95%CI 1.81; 95.70] following balanced calorie-restricted diet; I² = 86.8%, p < 0.001 Six studies implemented calorie-restricted diets; one used low free-sugar diet; one used CHILD-1 diet Several butyrate-producing genera increased following dietary intervention: Clostridium XVIa, Coprococcus, Roseburia, Faecalibacterium, Blautia, Butyricimonas
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
While the finding that balanced calorie restriction increases microbiota richness and butyrate-producing bacteria is biologically plausible and consistent with microbiota health principles, the lack of demonstrated cardiometabolic outcome improvements, high heterogeneity, and limited pooled evidence mean clinicians cannot yet use microbiota changes as a validated surrogate for metabolic benefit in pediatric obesity management.
A systematic review and meta-analysis of 8 small pediatric dietary intervention trials (200 children total) showing a significant increase in microbiota alpha-diversity and butyrate-producing bacteria, but with substantial heterogeneity, limited cardiometabolic outcome data, and acknowledged evidence gaps that prevent definitive clinical recommendations.
As stated by the source record.
Quoted from the source exactly as published.
While the finding that balanced calorie restriction increases microbiota richness and butyrate-producing bacteria is biologically plausible and consistent with microbiota health principles, the lack of demonstrated cardiometabolic outcome improvements, high heterogeneity, and limited pooled evidence mean clinicians cannot yet use microbiota changes as a validated surrogate for metabolic benefit in pediatric obesity management.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Abstract Background Gut microbiota imbalances may contribute to obesity, yet whether dietary interventions can modulate the microbiota and improve metabolic health in pediatrics has not been thoroughly reviewed. This systematic review and meta-analysis explores the impact of dietary interventions on the gut microbiota of children and adolescents with overweight or obesity, and its association with cardiometabolic improvements. Methods A systematic search of clinical trials in Pubmed, Cochrane and EMBASE was conducted following PRISMA guidelines (PROSPERO n°CRD42024505494). Risk of bias was assessed with RoB2 and ROBINS, for randomized and non-randomized intervention studies. Results Overall, 60 articles were assessed for full-text eligibility, 8 were included, and 4 provided alpha-diversity data for meta-analysis. A total of 200 participants were included (6–16 years). Six studies implemented calorie-restricted diets, one a low free-sugar diet, and one CHILD-1 diet. The meta-analysis revealed a significant increase in Chao1 (48.76 [95%CI 1.81; 95.70]; I 2 = 86.8%, p < 0.001) following a balanced calorie-restricted dietary intervention. Although there was heterogeneity in taxa-level changes, several butyrate-producing genera ( Clostridium XVIa, Coprococcus, Roseburia, Faecalibacterium, Blautia, Butyricimonas ) increased following dietary intervention. Conclusions Balanced dietary interventions with calorie-restriction adequate for pediatric age could increase gut microbiota richness and butyrate-producing bacteria abundance. Future trials should clarify diet-driven gut microbiota changes in childhood obesity and related metabolic changes. Impact Balanced calorie restriction diet may increase gut microbiota richness in childhood obesity Butyrate-producer expansion needs long-term dietary intervention Gaps in linking microbiota-metabolism interplay in pediatric obesity
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