High carb for runners isn’t necessarily the way to go as the carbs you don’t use generally end up as being stored as fat.
Like in the Smarter Science of Slim, I say go for a more balanced diet if 33% carbs/protein/fat, and get the majority of your carbs from starchy veg (broccoli, carrots, spinach, beans, peppers) and fruit, or low GI carbs.
Avoid sugars and look out (and avoid) for simple carbohydrates which will be turned into sugars (and fat) in your body. Sugar is bad, and good (natural) fats (ie butter, milk, cheese, eggs, meat, fish, nuts, avocado, olive oil, seeds) are good.
Keep your carbs until after your workouts when the fire is burning and you use them up. 🙂