 The classic ketogenic diet is not a balanced diet and only contains tiny portions of fresh fruit and vegetables , fortified cereals and calcium @-@ rich foods . In particular , the B vitamins , calcium and vitamin D must be artificially supplemented . This is achieved by taking two sugar @-@ free supplements designed for the patient 's age : a multivitamin with minerals and calcium with vitamin D. A typical day of food for a child on a 4 : 1 ratio , 1 @,@ 500 kcal ( 6 @,@ 300 kJ ) ketogenic diet comprises : 
