I've been trying to do 50% carbs, 30% protein, and 20% fat, which my fitness app handily charts for me. Basically, if it's a snack I try to make it a protein or a fat (almonds, hard boiled egg, etc.) and have carbs for dinner and breakfast. I'm too busy to prepare most of my own lunches, so I've been relying on Lean Cuisine meals - easy to calculate calories and nutrients and easy to throw in my bag.