Key Takeaway
Ketogenic dietary therapies reduce seizure frequency by at least 50% in roughly half of children and adolescents with drug-resistant epilepsy, with seizure freedom rates between 7-55% depending on the protocol used.
Summary
This systematic review of reviews evaluated the effectiveness of various ketogenic dietary therapies for treating refractory (drug-resistant) epilepsy specifically in children and adolescents. The authors comprehensively analyzed existing systematic reviews and meta-analyses to consolidate the evidence on the classic ketogenic diet, modified Atkins diet, low glycemic index treatment, and medium-chain triglyceride diet in pediatric populations.
The findings consistently show that ketogenic dietary therapies produce clinically significant seizure reductions in a substantial portion of pediatric patients who have failed to respond to antiepileptic medications. The classic ketogenic diet with a 4:1 fat-to-carbohydrate ratio tended to show the strongest efficacy, though less restrictive variants like the modified Atkins diet also demonstrated meaningful seizure control with potentially better adherence and tolerability in older children and adolescents.
The review highlights that despite the consistent positive findings across multiple reviews, the overall quality of evidence remains moderate due to reliance on observational studies and the inherent difficulty of conducting blinded dietary trials. The authors call for more rigorous randomized controlled trials and emphasize the importance of individualized dietary approaches based on patient age, seizure type, and family capacity.
Methods
Systematic review of reviews following PRISMA guidelines. The authors searched major databases for systematic reviews and meta-analyses published on ketogenic dietary therapies in children and adolescents with refractory epilepsy. Quality assessment of included reviews was performed using AMSTAR-2 criteria.
Key Results
Across included reviews, approximately 40-60% of pediatric patients on ketogenic diets experienced a greater than 50% reduction in seizure frequency. Seizure freedom rates ranged from 7% to 55% depending on the specific diet protocol and study. The classic 4:1 ketogenic diet showed somewhat higher efficacy than modified variants. Common adverse effects included gastrointestinal symptoms, hyperlipidemia, growth deceleration, and kidney stones, though most were manageable with monitoring.
Limitations
The review is limited by the quality of underlying primary studies, which are predominantly observational and unblinded. There is significant heterogeneity in diet protocols, outcome definitions, and follow-up durations across included reviews. Pediatric-specific subgroup data was not always available in the original meta-analyses. Publication bias in the underlying literature cannot be excluded.