Healthy Lunch ideas that Won’t Slow You Down. Breakfast is often called the most important meal of the day, but any nutritionist will tell you that every meal and snack is important. Lunch, in particular, is key to helping you power through the afternoon. Therefore, you want a balance of protein, complex carbohydrates, and vegetables to fill you up without slowing you down. A little healthy fat also gives the meal some staying power. That said, there’s a lot more to a healthy lunch than a boring salad.