Cruciferous vegetables are the mainstay when it comes to “zero-calorie” foods, and broccoli is one of the best ones for you. Its deep green hue is a dead giveaway that it’s full of cancer-fighting phytochemicals. Broccoli is also packed with gut-filling fiber. “Foods that are high in fiber are typically the ones that are going to make you feel full longer," Lemond notes. Eat it raw or steam a large portion for a filling snack or side.