Lettuce: Mostly water and fiber, lettuce is extremely low in calories. A cup of shredded lettuce has only about 5 calories
Cucumber: High in water content, cucumbers are refreshing and very low in calories. A half-cup of sliced cucumber contains around 8 calories
Celery: Famous for its negative calorie effect (it takes more calories to digest it than it contains), celery has about 6 calories per stalk
Radishes: These crunchy vegetables are low in calories and high in fiber. A half-cup of sliced radishes has around 9 calories
Zucchini: Another vegetable with high water content, zucchini is low in calories. A cup of sliced zucchini has about 20 calories
Strawberries: A sweet treat that's also low in calories, strawberries provide fiber and essential nutrients. A cup of whole strawberries has around 50 calories
Broccoli: Rich in fiber and vitamins, broccoli is low in calories. A cup of chopped broccoli contains about 55 calories
Spinach: Packed with nutrients and antioxidants, spinach is very low in calories. A cup of raw spinach has only about 7 calories