Ketogenic Diet Therapy for Epilepsy and Seizure Control

The ketogenic diet was developed as a medical treatment for epilepsy in the 1920s. Primary clinical research—including randomized trials in children, adolescents and adults—shows that ketogenic dietary therapies reduce seizures in drug-resistant epilepsy.[2,10,11] National guidelines and international consensus statements provide additional authority and standards for delivering this treatment safely.[3–7]

This is different from casually “trying keto.” Therapeutic ketogenic diets for epilepsy are prescribed and monitored by a medical team. The amount of carbohydrate, protein and fat is individualized, and medications, hydration, laboratory values, growth and side effects may all require active management.

For the right patient, ketogenic diet therapy can substantially reduce seizure burden and sometimes produce seizure freedom.[1,2]

A guideline-supported treatment—not a fringe diet

Ketogenic dietary therapy is now recognized across major epilepsy organizations, national clinical guidance and specialist consensus statements.

The efficacy claim rests on primary clinical research. The guidelines and consensus statements below are additional authority: they show that specialist organizations have incorporated that evidence into clinical recommendations and implementation standards.

• The American Epilepsy Society's 2026 clinical practice guideline suggests ketogenic diet therapy rather than no ketogenic diet for infants and children from 1 month to younger than 3 years with drug-resistant epilepsy. It prefers the classic ketogenic diet over the modified Atkins diet in this age group and notes that dietary therapy may be considered first-line for glucose transporter type 1 deficiency and pyruvate dehydrogenase deficiency.[3]
• The International Ketogenic Diet Study Group's pediatric consensus recommendations describe ketogenic dietary therapies as established, effective nonpharmacologic treatments for intractable childhood epilepsy. The group recommends strong consideration after two appropriate antiseizure drugs have failed and earlier use in several responsive epilepsy syndromes.[4]
• International adult recommendations report strong expert consensus for offering ketogenic dietary therapies to adults with antiseizure-medication-resistant focal epilepsy. These recommendations also establish practical standards for evaluation, diet selection, supplementation, monitoring and discontinuation.[5]
• The United Kingdom's NICE national guideline advises clinicians to consider ketogenic diet therapy under a tertiary epilepsy specialist for drug-resistant epilepsy when other treatment options have been unsuccessful or are not appropriate, as well as for several childhood-onset epilepsy syndromes.[6]
• The International League Against Epilepsy maintains a dedicated Dietary Treatments Task Force and clinical resource hub for ketogenic diet therapy.[7]

The exact diet, timing and recommendation strength differ by age and epilepsy syndrome. The broad consensus is nevertheless clear: ketogenic dietary therapy is a recognized specialist treatment for drug-resistant—also called refractory or intractable—epilepsy. It is not merely a wellness diet or an unstructured attempt to “eat keto.”

Epilepsy and seizures are related but not identical

A seizure is a temporary burst of abnormal electrical activity in the brain. Epilepsy is a neurological disorder characterized by an enduring tendency to have unprovoked seizures.

Seizures can have many causes, including epilepsy, fever, infection, low blood glucose, electrolyte abnormalities, head injury, medication effects, alcohol withdrawal and other acute illnesses. A first or unexplained seizure requires medical evaluation rather than a dietary experiment.

Drug-resistant epilepsy is generally diagnosed when seizures continue despite adequate trials of two appropriate and tolerated antiseizure medication regimens. This is the setting in which dietary therapy is most commonly considered.[1,4–6]

How ketogenic therapy may reduce seizures

Ketogenic diets change brain energy metabolism by reducing glucose availability and increasing production of ketones. The therapeutic effect involves more than simply having ketones in the blood.

Proposed mechanisms include:

• More efficient mitochondrial energy production
• Changes in the balance between excitatory and inhibitory neurotransmission
• Effects on ATP-sensitive potassium channels and neuronal excitability
• Changes in oxidative stress and inflammation
• Altered gut-microbiome signaling
• Effects from specific fatty acids and ketone bodies

These pathways can stabilize neuronal networks and reduce the tendency toward recurrent seizures.[1]

The main therapeutic diet options

Classic ketogenic diet

The classic ketogenic diet uses a carefully calculated ratio of fat to combined protein and carbohydrate. It produces sustained nutritional ketosis and is often used in pediatric epilepsy programs.

Modified Atkins diet

The modified Atkins diet restricts carbohydrate while allowing more flexibility with protein, calories and fluids. It can be easier to implement for adolescents and adults while still producing ketosis.

Low-glycemic-index treatment

Low-glycemic-index treatment permits more carbohydrate than the classic ketogenic diet but limits carbohydrate sources to those with a low glycemic index. It generally produces lower ketone levels and may be easier for some families to maintain.

The correct diet depends on the patient’s age, seizure syndrome, medical history, treatment goals, food preferences and ability to follow the plan safely.

What randomized trials found

The original Toward Health source cited a randomized clinical trial comparing the classic ketogenic diet, modified Atkins diet and low-glycemic-index treatment in children with drug-resistant epilepsy.[2]

The trial enrolled 170 children between 1 and 15 years old. After 24 weeks, 158 completed the study. Median seizure frequency fell:

• 66% with the classic ketogenic diet
• 45% with the modified Atkins diet
• 54% with low-glycemic-index treatment

More than half of participants achieved at least a 50% seizure reduction across all three groups: 67.3% with the classic ketogenic diet, 51.9% with the modified Atkins diet and 59.3% with low-glycemic-index treatment.[2]

The classic ketogenic and modified Atkins diets produced a rapid decline during the first four weeks. Low-glycemic-index treatment reached approximately a 50% reduction more gradually, between weeks 10 and 12.[2]

These results show that several forms of therapeutic carbohydrate restriction can reduce seizure burden. They also give families more than one dietary option to discuss with an epilepsy team.

Classic ketogenic diet versus continued usual care

A landmark randomized controlled trial enrolled 145 children ages 2 to 16 whose seizures had not responded to at least two antiseizure medications. After three months, the mean percentage of baseline seizures was 62.0% in the ketogenic-diet group compared with 136.9% in the control group. A seizure reduction greater than 50% occurred in 38% of the diet group compared with 6% of controls; 7% of the diet group had a reduction greater than 90%, compared with none of the controls.[10]

Modified Atkins diet in adolescents and adults

A 2023 randomized controlled trial studied 160 people ages 10 to 55 with drug-resistant epilepsy. At six months, 26.2% of participants receiving a modified Atkins diet plus standard drug therapy achieved a seizure reduction greater than 50%, compared with 2.5% receiving standard drug therapy alone. Quality-of-life scores also improved more in the diet group.[11]

Together with the three-diet pediatric trial above, these randomized studies form the primary evidence base for efficacy across ketogenic formulations and age groups.[2,10,11]

Results across children and adults

The review preserved from the Disciple article summarizes ketogenic-diet studies across different ages and dietary formats.[1]

Examples include:

• In a study of 20 children using a modified Atkins diet, 65% had a seizure reduction greater than 50%, 35% improved by more than 90%, and four were seizure-free at six months.
• Across eight adult studies of modified Atkins diets, the proportion with more than 50% seizure reduction ranged from 20% to 70%, while seizure-freedom rates ranged from 7% to 30%.
• Low-glycemic-index studies also reported substantial seizure reductions, including cohorts in which approximately half achieved at least a 50% reduction.[1]

Response varies by epilepsy syndrome and by individual. Some genetic and metabolic epilepsies are particularly responsive to ketogenic therapy. For glucose transporter type 1 deficiency and pyruvate dehydrogenase deficiency, international recommendations identify ketogenic therapy as a treatment of choice, and the 2026 American Epilepsy Society guideline allows consideration as first-line dietary therapy in young children.[3,4] Other patients may be better served by medication adjustment, surgery, neurostimulation or a combination of treatments.

Why medical supervision matters

Therapeutic ketogenic diets can affect glucose, acid-base balance, hydration, bowel function, kidney-stone risk, micronutrient intake, lipids and medication levels. Children also require monitoring of growth.

In the randomized trial, treatment-related adverse events occurred in 56.4% of the classic ketogenic group, 56.9% of the modified Atkins group and 33.3% of the low-glycemic-index group. Vomiting was the most common reported event.[2]

A supervised program may include:

• Baseline medical and nutrition assessment
• Review of antiseizure medications and carbohydrate-containing formulations
• Laboratory testing
• Vitamin and mineral supplementation
• Hydration and bowel-management planning
• Seizure and food tracking
• Ongoing review of growth, weight, symptoms and treatment response

These are not merely local precautions. Pediatric and adult consensus recommendations, NICE guidance and the National Institute of Neurological Disorders and Stroke all emphasize specialist or multidisciplinary monitoring so that efficacy, nutrition, medications and potential adverse effects can be managed together.[3–6,8]

Antiseizure medications should never be stopped or reduced without the prescribing clinician. Improved seizure control may eventually allow medication changes for some patients, but those decisions require a planned medical process.

What families should expect

The diet is generally added to existing antiseizure treatment rather than used as an immediate replacement. The team chooses the dietary format, teaches meal preparation and establishes monitoring before or during initiation.

Families should know the plan for illness, vomiting, low blood glucose, dehydration, medication administration and breakthrough seizures. They should also know when and how to measure ketones if the epilepsy program uses ketone monitoring.

The goal is not the highest possible ketone reading. The goal is fewer seizures with adequate nutrition, tolerable side effects and a plan the patient and family can sustain.

When a seizure is an emergency

Call emergency services when:

• A seizure lasts five minutes or longer
• Another seizure begins before the person recovers
• The person has trouble breathing or does not regain consciousness
• A seizure occurs in water
• The person is injured, pregnant or has diabetes
• It is the person’s first known seizure
• The event differs significantly from the person’s established seizure plan

Follow the patient’s prescribed seizure-action plan when one is available. During a convulsive seizure, protect the person from injury, place them on their side when possible, time the seizure, and do not restrain them or place anything in their mouth.[9]

The takeaway

Ketogenic diet therapy is an established, guideline-supported treatment for drug-resistant epilepsy. In a randomized trial, the classic ketogenic diet, modified Atkins diet and low-glycemic-index treatment each produced substantial reductions in seizure frequency.[2]

National guidance and international consensus now place ketogenic dietary therapy within mainstream specialist epilepsy care, including consideration after two appropriate medications have failed and earlier use for selected epilepsy syndromes.[3–7] The diet should be selected and monitored as medical nutrition therapy. With the right team and a plan matched to the patient, therapeutic carbohydrate restriction can become a powerful part of comprehensive epilepsy care.

Trusted epilepsy resources

• International League Against Epilepsy: Ketogenic Diet Therapies
• National Institute of Neurological Disorders and Stroke: Epilepsy and Seizures
• CDC: First Aid for Seizures

References

1. D’Andrea Meira I, Romão TT, Pires do Prado HJ, Krüger LT, Pires MEP, da Conceição PO. Ketogenic Diet and Epilepsy: What We Know So Far. Front Neurosci. 2019;13:5. doi: 10.3389/fnins.2019.00005.

2. Sondhi V, Agarwala A, Pandey RM, et al. Efficacy of Ketogenic Diet, Modified Atkins Diet, and Low Glycemic Index Therapy Diet Among Children With Drug-Resistant Epilepsy: A Randomized Clinical Trial. JAMA Pediatr. 2020;174(10):944–951. doi: 10.1001/jamapediatrics.2020.2282.

3. Freedman D, Babatunde I, Morgan RL, et al. American Epilepsy Society Clinical Practice Guideline: Infantile Epilepsy. Epilepsy Curr. 2026;26(3):174–202. doi: 10.1177/15357597261433266.

4. Kossoff EH, Zupec-Kania BA, Auvin S, et al. Optimal clinical management of children receiving dietary therapies for epilepsy: Updated recommendations of the International Ketogenic Diet Study Group. Epilepsia Open. 2018;3(2):175–192. doi: 10.1002/epi4.12225.

5. Cervenka MC, Wood S, Bagary M, et al. International Recommendations for the Management of Adults Treated With Ketogenic Diet Therapies. Neurol Clin Pract. 2021;11(5):385–397. doi: 10.1212/CPJ.0000000000001007.

6. National Institute for Health and Care Excellence. Epilepsies in children, young people and adults (NG217): Non-pharmacological treatments, section 8.1 Ketogenic diet. Published April 27, 2022. Guideline.

7. International League Against Epilepsy. Ketogenic Diet Therapies. Clinical resource hub.

8. National Institute of Neurological Disorders and Stroke. Epilepsy and Seizures. Patient and clinician information.

9. Centers for Disease Control and Prevention. First Aid for Seizures. Updated May 15, 2024. Seizure first-aid guidance.

10. Neal EG, Chaffe H, Schwartz RH, et al. The ketogenic diet for the treatment of childhood epilepsy: A randomised controlled trial. Lancet Neurol. 2008;7(6):500–506. doi: 10.1016/S1474-4422(08)70092-9.

11. Manral M, Dwivedi R, Gulati S, et al. Safety, Efficacy, and Tolerability of Modified Atkins Diet in Persons With Drug-Resistant Epilepsy: A Randomized Controlled Trial. Neurology. 2023;100(13):e1376–e1385. doi: 10.1212/WNL.0000000000206776.