Solid nutrition is about all you can do food wise. Opinions differ on what "solid nutrition" is..but google John Berardi's articles on the subject, and consider purchasing some of his books, or Tom Venuto's "Burn the Fat, Feed the Muscle."
Some quick rules, if you're lazy:
* eat 5-6 times a day
* get lean protein and vegetables/fruit at every feeding
* get around 30% of your calories come from fat, split roughly evenly among satured, monounsatured and polyunsatured
* drink lots of water
* aim for 90% good eating, this means cheating very occasionally
* eat starchy carbs only in the post-workout window (the next 1-2 meals after heavy exercise)
* get proper nutrition around strenuous physical activity
* get enough sleep!
All of that should help to maximize your nutritional effort, the rest is, as they say, genetics. Best wishes.
