"Veggies are mostly water—about 90 percent," Blatner says. So you'll feel full long before you overdo it. Plus, veggies are one of the most portable snacks around. "Celery, carrots, grape tomatoes, snow peas and broccoli are the best finger-food veggies." Pop them in a plastic bag and eat on the go. It'll save you from giving in to drive-thru disasters like these!