The ketogenic diet is a high-fat, abundant protein, low-carbohydrate diet, which is mainly used in medicine to treat uncontrollable epilepsy in children. This diet forces the body to burn fat instead of carbohydrates. Usually, carbohydrates in food are converted to glucose before being transported in the body. Glucose is also an important energy for the brain. However, if there are only a few carbohydrates in the diet, the liver will convert fat into fatty acids and ketones.

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In the process of ordinary eating, the body will also produce ketone bodies, but there are not many opportunities for production, and the production amount is not enough to reach the concentration of nutritional ketosis.

The ketogenic diet eats low sugar, moderate protein, and high oil in order to allow the body to stay in nutritional ketosis for a longer time, to increase the blood ketone concentration (representing fat burning), and to determine the effect of re-burning fat.
After entering stable ketosis, you can enjoy the benefits of a ketogenic diet to your body, such as improving hormones, appetite, antioxidants, etc., and weight loss is usually a side effect.

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生酮飲食(ketogenic diet )是一種高脂肪，充足蛋白質，低碳水化合物飲食，醫學上主要在用於治療難以控制的兒童癲癇。這種飲食強迫身體 燃燒脂肪 而非碳水化合物。通常，食物中的碳水化合物會轉化為葡萄糖，才在體內運輸。葡萄糖也是大腦的重要能量。然而，如果飲食中只有少量碳水化合物，肝臟會將脂肪轉化為脂肪酸和酮體。

普通吃法過程中，身體也會製造出酮體，只是製造的機會不多，以及製造量不足以達到營養性酮症的濃度。
生酮飲食吃低醣、適中、蛋白高油就是為了要讓身體待在營養性酮症的時間長一點，讓血酮濃度高一點（代表脂肪燃燒），而確定身體再燃脂的效果。
進入穩定的酮症之後，就可以享有生酮飲食帶給身體的優點，像是改善荷爾蒙、食慾、抗氧化等等的，而減肥通常也是一個附帶的效果。