Apart from water and some very thin soups, vegetables are the lowest calorie food group. While nearly every vegetable is low in calories, some are lower than others.

To keep vegetables low in calories and retain the most nutrients, it is best to eat them raw or steamed.

Low-calorie vegetables include watercress, lettuce, arugula, sprouts, napa cabbage, cucumber, and celery. Below are the 20 lowest calorie vegetables. For more see the full ranking of over 200 low-calorie vegetables.

For more low calorie foods, see the article on foods low in calories.