Crackers, fruit, and granola bars are common snacks, but who says a snack has to be made from "snack food"? Smaller servings of leftovers make great snacks. Just prepare yourself a serving size that's 200 calories or less. Last night's soup, a piece of chicken on a small piece of bread, some pasta and cheese, or roasted veggies make great snacks. Not only will you be getting a unique and healthy snack pick-me-up, but it's a great way to make sure leftovers don't go to waste.