Mother Nature provided us with all of the delicious, filling and low-calorie snacks we could possibly need. So why do we turn to those unnaturally orange cheese doodles when we're hungry? Ditch the oh-so-unhealthy processed foods in favor of fruits like grapes, berries and apples. Fresh fruit is naturally low in calories and fat content, and it's also packed with vitamins and disease-fighting antioxidants, which can keep the sniffles at bay as the big day approaches. Another bonus? Many fruits, like apples, bananas and oranges, are portable and easy to enjoy at your desk, at home or anywhere in between.