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?
. The ketone bodies pass into the brain and replace glucose as an energy source. An elevated level of ketone bodies in the blood, a state known as ketosis, leads to a reduction in the frequency of epileptic seizures. Around half of children and young people with epilepsy who have tried some form of this diet saw the number of seizures drop by at least half, and the effect persists even after discontinuing the diet. Some evidence indicates that adults with epilepsy may benefit from the diet, and that a less strict regimen
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Management Diet.
There is tentative evidence that a ketogenic diet (high-fat, low-carbohydrate, adequate-protein) decreases the number of seizures and eliminate seizures in some; however, further research is necessary. It is a reasonable option in those who have epilepsy that is not improved with medications and for whom surgery is not an option. About 10% stay on the diet for a few years due to issues of effectiveness and tolerability. Side effects include stomach and intestinal problems in 30%, and