Exogenous ketones (in the form of BHB salts and ketone esters) only provide a temporary increase in blood ketone levels. The ketogenic diet is based on the basic idea that the body will always burn glucose (which breaks down from the carbohydrates) before it burns ketones (which are the breakdown of fat). It's called "Targeted" with the idea that you need to utilize the carbohydrate intake immediately prior to or after your exercise.