Keto and Epilepsy: The Original Medical Use

The ketogenic diet has roots in clinical medicine, not weight loss trends. In the 1920s, American neurologists noticed fasting reduced seizures in children with epilepsy. They developed the high-fat, low-carb ketogenic diet as a sustainable alternative to starvation. Nearly a century later, it remains a therapeutic option for drug-resistant epilepsy.

How ketosis affects brain activity

Ketones—produced when the body burns fat for fuel—appear to stabilise electrical activity in the brain. Research suggests they may:

Reduce neuronal excitability
Enhance GABA (a calming neurotransmitter)
Decrease inflammatory markers

A 2013 review in the European Journal of Clinical Nutrition noted ketogenic diets show particular promise for children whose seizures don’t respond to medication (Paoli et al., 2013). The same mechanisms that help with epilepsy may also explain why some people report improved focus on keto.

The clinical protocol

Medical ketogenic diets for epilepsy typically follow stricter ratios than lifestyle keto:

4:1 ratio (4g fat to 1g protein+carbs)
90% calories from fat
Measured portions

Patients work with neurologists and dietitians, often starting in hospital. Blood ketones are monitored closely. This differs from nutritional ketosis, where people aim for 0.5-3.0 mmol/L blood ketones. Therapeutic ketosis for epilepsy often targets higher levels.

What this means in practice

Implementing medical keto requires planning. At Tesco, staples like double cream (£1.20 for 300ml) and ground almonds (£2.50 for 200g) become essential. Seasonal UK berries work better for carbs than tropical fruit—50g of raspberries contains about 2.5g net carbs versus 8g in the same amount of mango.

The NHS recommends medical supervision for anyone considering keto to manage epilepsy. While some adults use modified versions successfully, the classic protocol remains most studied for seizure control.

Frequently asked questions

Is the ketogenic diet safe for children with epilepsy?

Under medical supervision, yes. Paediatric neurologists may recommend it when two or more medications fail. Growth and development are monitored closely. The modified Atkins diet (lower ratio) is sometimes used as an alternative.

How long does it take to see results?

Some children experience fewer seizures within weeks. Full effects may take 2-3 months. About half of patients on medical keto see at least a 50% reduction in seizures (Paoli et al., 2013).

Can adults with epilepsy benefit?

Yes, though most research focuses on children. Adults may need to combine keto with medication. The keto adaptation timeline tends to be longer for adults.

The bottom line

The ketogenic diet’s effectiveness for epilepsy isn’t controversial—it’s one of the few nutritional interventions with Level 1 evidence in neurology. While not a cure, it offers another tool when medications fall short. Implementation requires precision, especially for children. If you’d rather not do the macro maths yourself, the Keto Dieting app does it for you on Google Play and the App Store.

Educational only — not medical advice. This article is for general information. Speak to your GP before changing your diet, especially if you have type 1 or type 2 diabetes, kidney or liver disease, are pregnant or breastfeeding, or take medication for blood pressure, cholesterol, or blood glucose.

References

Paoli A, Rubini A, Volek JS, Grimaldi KA (2013). Beyond weight loss: a review of the therapeutic uses of very-low-carbohydrate (ketogenic) diets. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.116
Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T (2013). Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition. https://doi.org/10.1017/S0007114513000548