30 year-old female, 135 lbs, and I will start training for my 3rd half-marathon next week. I'm new to Paleo/Primal so this will be my first training period eating this way. I've got 2 questions: 1) what should my carb intake be for half-marathon training, and 2) what Primal fuel do you recommend I carry on my long runs?

As far as what my training plan will look like: 4 runs a week, mixed up of short sprints, a moderate run, and 1 longer run, each week.