# Dietary Therapy in Epilepsy > Ketogenic and modified Atkins diets, indications, initiation protocols and complications in NEET-SS Paediatric Neurology. - Canonical URL: https://prepelephant.com/topics/neet-ss/paediatric-neurology/dietary-therapy-epilepsy - Exam / course: NEET-SS · Subject: Paediatric Neurology - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Dietary Therapy in Epilepsy", PrepElephant, https://prepelephant.com/topics/neet-ss/paediatric-neurology/dietary-therapy-epilepsy ## Direct answer The classic ketogenic diet is a high-fat, low-carbohydrate, adequate-protein prescription, computed as a ketogenic ratio of fat to protein-plus-carbohydrate of 3:1 or 4:1, that controls seizures in a substantial minority of drug-resistant children — roughly half achieve greater than 50 per cent seizure reduction — and it is the therapy of choice, ahead of any drug, in glucose transporter type 1 deficiency and pyruvate dehydrogenase deficiency. Practical variants have widened access: the medium-chain triglyceride diet, the modified Atkins diet with carbohydrates around 10 to 20 g per day, and the low glycaemic index treatment, the last two tolerable without hospitalisation. Screen before starting, because beta-oxidation defects, pyruvate carboxylase deficiency and porphyria are absolute contraindications in which the diet can be lethal. ## What you must remember - Ketogenic ratio 3:1 or 4:1 (grams of fat to grams of protein plus carbohydrate); 4:1 is more ketogenic but harder to tolerate, and infants often do well at 3:1 or 2:1 with added medium-chain triglyceride. - Diet-of-choice indications: GLUT1 deficiency (seizures plus movement disorder, acquired microcephaly, low CSF glucose with low CSF lactate) and pyruvate dehydrogenase deficiency — where ketones bypass the blocked glycolytic pathway. - Strong-syndrome indications: Dravet, Lennox-Gastaut, West syndrome refractory to hormones, myoclonic-astatic epilepsy (Doose), tuberous sclerosis-related epilepsy and febrile infection-related epilepsy syndrome. - Efficacy benchmarks worth quoting: about half of treated children reach over 50 per cent seizure reduction, a minority become seizure-free, and response usually declares itself within one to three months. - Contraindications: fatty acid beta-oxidation defects such as MCAD deficiency, carnitine palmitoyltransferase deficiencies, pyruvate carboxylase deficiency and porphyria; a history suggestive of these demands a metabolic screen before starting. - Complications: early hypoglycaemia and acidosis, later constipation, growth faltering in the youngest, nephrolithiasis in roughly 5 to 7 per cent, dyslipidaemia, and selenium and zinc deficiency — the diet mandates micronutrient, calcium, vitamin D and often carnitine supplementation. - Medication housekeeping: carbohydrate-laden syrups and suspensions break ketosis, so swap to sugar-free formulations — a detail examiners relish — and watch valproate-related carnitine depletion. - Wean antiseizure drugs rather than celebrate the diet in isolation: the usual plan is diet initiation, seizure confirmation of response, then staged drug withdrawal. ## Starting the diet, step by step A four-year-old with Lennox-Gastaut on three drugs and weekly falls reaches the diet clinic. Step one is the pre-diet evaluation: seizure and medication review, growth assessment and a dietitian-led food history — in Indian kitchens the dietitian rebuilds meals around ghee, cream, oils, paneer and eggs, with coconut oil and medium-chain triglyceride supplements for vegetarian families. Step two is screening: basic metabolic panel including glucose, calcium, electrolytes, liver and renal profiles, lipid profile, urine for ketones and any suspicion-driven metabolic studies to exclude beta-oxidation disease. Step three, choose the format — for a school-aged child, many centres now start the modified Atkins diet at home, carbohydrate-limited to about 10 g per day initially and liberalised later, reserving classical 4:1 admission-based initiation for infants, tube-fed children or refractory status. Step four, teach ketone monitoring — urine dipsticks or capillary beta-hydroxybutyrate — with target ketosis and a sick-day plan, since illness, hidden sugars and vomiting disrupt it. Step five, audit at one and three months: seizure diary, growth, ketone readings, and the medication review for sugary syrups to be exchanged for tablets. Step six, set expectations — a three-month trial if tolerated, drug taper on response, and gradual liberalisation after about two years of control, with continued growth and bone surveillance. ## Where students slip The classic slip is treating the diet as a last resort of fringe value — its evidence in Dravet, Doose and GLUT1 deficiency is stronger than that of most add-on drugs, and in GLUT1 deficiency the diet outranks drugs entirely. The second is skipping the contraindication screen: a child who deteriorates into hypoketotic hypoglycaemia on the diet has a beta-oxidation defect, and the exam answer is to stop the diet and investigate, not to push the ratio higher. The third is forgetting that the diet is a calculated medical prescription — "just avoid sugar" is not the ketogenic diet, and pharmacists swapping a sugar-free formulation is part of its management. ## Frequently asked questions ### What is the ketogenic ratio? The ratio of grams of fat to grams of protein plus carbohydrate, classically 3:1 or 4:1, individually adjusted for tolerance and age. ### In which two disorders is the ketogenic diet the treatment of choice? Glucose transporter type 1 deficiency and pyruvate dehydrogenase deficiency, where ketones bypass the defective energy pathway. ### What are the absolute contraindications to the diet? Fatty acid beta-oxidation defects, pyruvate carboxylase deficiency and porphyria — the diet can precipitate severe metabolic decompensation. ### How does the modified Atkins diet differ? It restricts carbohydrates to about 10 to 20 g per day with fat encouraged freely and protein unrestricted, needing no admission, fasting or strict weighing. ### Which complication occurs in 5 to 7 per cent of children on the diet? Kidney stones, warranting hydration counsel and monitoring alongside growth, lipids and micronutrient status.