One of the things runners especially beginner or novice runners tend to forget the importance of protein by focusing on the old mantra of carbo loading. The combination of easy access, easy preparation, and easy identification, we tend to grab a bagel or some pasta. We forget the importance of protein to our success and more importantly when to consume that protein to optimize the benefits.
This is an article from Running Times explaining critical times to intake protein and the amount of the protein you should consume while providing examples. I found it very informative and hopefully it will help you in achieving your fitness goals. RUNBEST!