Low Carb, High Fat ketogenic diets have been used to help control seizures in people with epilepsy for many years. The diet was originally adopted and developed at John Hopkins Hospital in the 1930s after improvements in epileptic children were noted whilst fasting. For eighty years, studies have shown that an LCHF diet reduces or prevents seizures in many children whose seizures could not be controlled by medications. There are no records of these children developing heart disease due to the diet.
Further information can be found via The Charlie Foundation