Hello NR,
A rule of thumb appears to be 60% carbs, 25% protein, 15% fat. Complex carbs such as pasta etc are best. I think there's a nutrition bit on this new website. You might want to take a look at that first.
I just thought. When you said diet, did you mean in order to lose weight or to fuel your running?
BTW, how about a picture??
All the best,
RB