Leftovers make a great lunch the next day. If you make your own meals you can keep track of what's in them. Just make an extra serving, or two and you are all set. DONT use that method if you are using a meal replacement option for your lunch. That'll just tempt you to eat more than you need to. PLUS if you cook less food, you'll find even the more expensive, healthier options aren't THAT much more per meal to use/eat.