A salad with a protein topper is a perfect, portable choice. Choose dark greens over iceberg lettuce, and add color (and nutrients) with peppers, mushrooms, carrots and broccoli. Top with sliced chicken breast or canned tuna or salmon. For vegetarian options, try diced hard-boiled egg, low-fat cheese or tofu, or beans or chopped nuts. Keep low-carb dressing on the side so your veggies stay crunchy until you’re ready to eat.