My brother is on a ketogenic diet.  It stresses the importance of low carbs and high fat.  Have you ever heard of it?
sure have, I've done it myself. it is really high fat, adequate protein, low carbohydrate.
Yes I tried it a few years ago, as well.  I still try to keep my white carbs in check so I don't have as many sugar cravings.  What other kinds of diets have you tried?
It is useful because the diet forces the body to burn stored fats for energy rather than carbs, you should give it another try, it is all about willpower. I haven't really do any other fad diets.
It just wasn't sustainable for me long term since I started distance running.  Carbohydrates really help my endurance.  
yeah the diet forces the body to start releasing ketones for energy. Yeah you really shouldn't distance run on that diet.
I just recently started trying to push myself for distance instead of time in regards to my running.  What kind of exercise routine do you follow?
Another benefit to the Keto diet is it lowers the chance for epileptic seizures, I don't know if you were aware of that. I'm trying to build muscle currently so I am not distance running, I'm lifting really heavy!
The high fat content of the diet is incredibly beneficial for those who suffer from seizure disorders.  It is also good for those that may be struggling with metabolic syndromes or diabetes.
yeah there are some research that adults as well as children can benefit from the diet if they have epilepsy.