Orally administrable composition for a ketogenic diet, comprising a mass proportion of lipids of between 70 and 92 percent, including 30 to 65 percent of medium-chain triglycerides, known as MCTs (C6 to C12 fatty acid triglycerides), and from 5 to 15 percent of taurine, preferably between 7 and 12 percent of taurine, and a thickener chosen from an edible wax with a melting point of between 55 and 85 degrees centigrade The composition for a ketogenic diet is prepared according to the method comprising mixing said edible wax and the MCT triglycerides, with stirring, at a temperature at which the edible wax is liquid, adding taurine, then, after cooling, introducing the other ingredients, still with stirring, in order to obtain said composition capable of thickening while standing at ambient temperature and of returning to a fluid appearance with stirring, while at the same time preserving the homogeneity thereof.