You should eat a lot of protein, carbs, and veggies - even more than with other meals. Breakfast and dinner can be higher in fat than lunches depending on your schedule, but lunch should be rich with complex carbs, good proteins, and a wide range of plant-based vitamin and mineral sources. Lunch can be super simple with a combination of a protein source, a starch source, and then 1-3 portions of veggies. Add some fruit or a side snack and you’re probably able to rack up 1000-1500 calories with ease.