While some amino acids, such as leucine and lysine, can be converted to ketones, others can be converted into glucose and may therefore raise blood glucose and insulin levels if consumed in excessive amounts. For this reason, we suggest consuming no more than 20 to 35 percent of your calories from protein. Keep in mind that the optimal level varies from individual to individual—for instance, someone using a ketogenic diet to help with epilepsy may need less protein than someone using it to try to gain high amounts of muscle mass.