Ketogenic Diet

The ketogenic diet (KD) is a nutritional approach characterized by high fat, low carbohydrate, and adequate protein intake, aiming to induce a metabolic state of ketosis. In response to carbohydrate restriction, the body produces ketone bodies to meet its energy needs. This state is particularly used as a therapeutic tool in the treatment of epilepsy.

The ketogenic diet is primarily applied in the treatment of drug-resistant epilepsy, but it may also be used for certain metabolic disorders (such as glucose transporter type 1 deficiency and pyruvate dehydrogenase complex deficiency), some neurological conditions, and rarely in oncological diseases. It is known to reduce the frequency and severity of seizures by providing ketones as an alternative energy source to glucose. The diet is typically administered to children aged two years and older, with the treatment process managed by neurology and dietetics specialists.

• Classic ketogenic diet: Typically has a fat-to-carbohydrate-plus-protein ratio of 4:1 or 3:1.
• MCT (medium-chain triglyceride) diet: The majority of energy is derived from medium-chain fatty acids.
• Modified Atkins diet and low glycemic index treatment: Alternative approaches with more flexible carbohydrate restrictions.

Before initiating the diet, a comprehensive clinical evaluation is conducted, followed by initiation of the diet under hospital conditions. A fasting period may be employed if deemed necessary to induce ketosis. Subsequently, individualized meal plans are developed according to the prescribed macronutrient ratios.

The ketogenic diet has both acute and long-term side effects. In the initial phase, hypoglycemia, dehydration, nausea, vomiting, and lethargy may occur. Over the long term, complications such as constipation, growth retardation, vitamin and mineral deficiencies (particularly vitamin D, calcium, and selenium), osteopenia, kidney stones, pancreatitis, low albumin, and low carnitine have been reported.

The incidence of kidney stone formation ranges between 3% and 10%. To reduce this risk, adequate fluid intake and potassium citrate supplementation are recommended. Serum lipid profiles may show increases in total cholesterol, LDL, and triglyceride levels, particularly during the first six months, along with a decrease in HDL levels.

The diet also affects bone health. The risk of osteopenia may increase due to the effects of antiepileptic drugs on vitamin D metabolism and the diet’s impact on mineral balance. Bone mineral density should be monitored during long-term use.

In recent years, the ketogenic diet has become one of the most popular diets for weight loss. However, scientific evidence regarding its long-term efficacy, safety, and potential health impacts for this purpose remains limited. The effects of the ketogenic diet on weight loss have not yet been conclusively established, and there is insufficient evidence to support its generalizability to the broader population. The desire for rapid results in obesity management may lead individuals toward such popular diets with limited scientific backing. This trend carries certain risks, including nutritional deficiencies caused by excessive energy restriction and inadequate intake of protein and micronutrients. Therefore, the ketogenic diet is recommended only under medical indication and professional supervision.^【1】