The ketogenic diet is based on a high intake of proteins and a low amount of carbohydrates. Introducing more proteins and fewer carbohydrates, combined with a reduction in calories, can lead to rapid weight loss.

This phase lasts up to 4 weeks, during which it is important to eliminate all sources of carbohydrates, including fruits, while you can add mineral salts such as sodium and magnesium as well as multivitamins.