Celery is part of the Apiaceae family, which includes carrots, parsnips, parsley, and celeriac. Its crunchy stalks make the vegetable a popular low-calorie snack, and it may provide a range of health benefits. The fiber in celery can benefit the digestive and cardiovascular systems. Celery has a long fibrous stalk tapering into leaves. Depending on location and cultivar, either its stalks, leaves or hypocotyl are eaten and used in cooking.