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Ketogenic diet therapies improve seizure reduction rates in children and adults with drug-resistant epilepsyKetogenic diet shows promise for people with drug-resistant epilepsy

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Key Takeaway
Note that ketogenic diet therapies provide measurable reductions in seizure frequency for both children and adults.

This systematic review and meta-analysis evaluates the efficacy of ketogenic diet therapies (KDT) for patients with drug-resistant epilepsy. The analysis synthesizes data across three age groups: children, adolescents, and adults. For children, 37% may achieve a reduction in seizure frequency of 50% or more, while approximately 6 more children per 100 may achieve a reduction of 90% or more.

For the adolescent and adult populations, the analysis found that 16 more individuals per 100 achieved a reduction in seizure frequency of 50% or more compared with usual care. Regarding safety, no significant differences were observed between KDT and usual care in children, though the impact on adults remains uncertain.

The authors note several limitations, including a limited number of reported events and imprecision for the 90% or greater reduction outcome in adolescents and adults. Furthermore, evidence regarding quality of life, cognitive outcomes, and behavioral outcomes is characterized as scarce, heterogeneous, and of very low certainty. Clinical application should be tempered by these uncertainties regarding long-term non-seizure outcomes.

How this fits prior evidence

This meta-analysis addresses a gap in quantifying the specific efficacy of ketogenic diet therapies for drug-resistant epilepsy across different age groups. It complements existing evidence regarding alternative interventions, such as MRI-guided laser interstitial thermal therapy which showed variable seizure freedom, and pharmacological considerations like DPP-4 inhibitors potentially reducing risk via the gut microbiota.

Living with drug-resistant epilepsy means finding ways to manage seizures when standard medications are not enough. New data shows that a ketogenic diet (KDT) can be an effective tool for patients of all ages. For children, about 37% may see their seizure frequency drop by at least half. Additionally, about 6 out of every 100 children might experience a much larger reduction, with seizures dropping by 90% or more.

For older patients, the results are also encouraging. The data shows that 16 more individuals per 100 adolescents and adults achieved at least a 50% reduction in seizures compared to standard care. While the evidence for these improvements is solid for children and teens, it is less certain for those over age 18.

Safety is a key concern when changing diets. For children, there were no significant differences in side effects compared to usual care. However, because fewer cases were reported for adults, the impact of the diet on older patients remains uncertain. While the results are promising, more research is needed to fully understand how these diets affect quality of life and behavior.

What this means for you:
A ketogenic diet can significantly reduce seizure frequency for children, teens, and adults with drug-resistant epilepsy.

Common questions

How effective is a ketogenic diet for children with epilepsy?

The data shows that 37% of children may achieve a reduction in seizure frequency of 50% or more. Additionally, about 6 out of every 100 children may see their seizures drop by 90% or more.

Is the ketogenic diet safe for children with epilepsy?

In studies involving children, there were no significant differences in adverse events compared to usual care. However, because of limited data, the certainty regarding side effects in children is currently low.

Does this treatment work for adults and adolescents too?

For adolescents and adults, 16 more individuals per 100 achieved a reduction in seizure frequency of 50% or more compared to usual care. However, evidence for larger reductions in these age groups is currently uncertain.

Study Details

Study typeMeta analysis
EvidenceLevel 1
Follow-up156.0 mo
PublishedJan 2026
View Original Abstract ↓
Epilepsy is a common treatable neurological condition characterized by recurrent involuntary brain activity manifested in seizures. It is estimated that around 30% of patients with this disease do not respond to initial pharmacological treatments, developing drug-resistant epilepsy. Among the non-pharmacological treatment options are ketogenic diet therapies (KDT) in its various forms. The objective of this study is to systematically review the randomized controlled trials investigating the use of KDTs in pediatric and adult drug-resistant epilepsy, according to Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) guidelines. The following databases: Embase, PubMed/Medline, LILACS, and the Cochrane Library, were searched and studies fitting the inclusion and exclusion criteria were included for analysis. Randomized controlled trials (RCT) with a minimum follow-up of 28 days were included. There were 1193 articles retrieved after duplicates were removed and 17 met the inclusion criteria. Eleven studies included children (up to 12 yrs) and six included adolescents from 13 years old and adults. Follow-up ranged from 6 to 24 months. In children, 37% may achieve a reduction in seizure frequency of 50% or more with in any form of KDT (moderate-certainty evidence). In addition, about 6 more children per 100 may achieve a ≥ 90% reduction, although this is supported by low-certainty evidence. In adolescents and adults, KDT may lead to a ≥ 50% reduction in seizure frequency in 16 more individuals per 100 compared with usual care (moderate-certainty evidence), but its impact on a 90% or greater reduction is uncertain due to the limited number of reported events and imprecision in available studies. Side effects in children showed no significant differences compared to usual care (low certainty), while in adults, the impact remains uncertain (very low certainty). Adherence to treatment may be slightly lower with KDT in both children and adults/adolescents compared to usual treatment, though results are inconsistent. Regarding quality of life and cognitive and behavioral outcomes, studies are scarce, heterogeneous, and of very low certainty, limiting the ability to draw strong conclusions.
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