The main principle of the keto diet is to get your body into a metabolic state called ketosis. When your body doesn’t receive enough carbohydrates it starts producing ketones — chemicals created by the liver to break down fats — and uses them as an alternative source of energy. To get into this state, one usually needs to eat less than 20-50 grams of carbohydrates a day. Though, there are different types of keto diets:

Standard ketogenic diet — very low carb (10%), moderate protein (20%), and high-fat diet (70%).
Cyclical ketogenic diet (CKD) — implies following 5-6 days of the standard ketogenic diet and then following 1-2 days of higher-carb intake.
Targeted ketogenic diet (TKD) — allows adding carbohydrates during the periods when you do workouts.
High protein ketogenic diet — similar to the standard ketogenic diet, but allows you to eat more protein. The ratio is normally as follows: fat — 60%, protein — 35%, carbs — 5%.

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