Celery is low in calories, fat, carbohydrates and cholesterol and is a good source of vitamins and minerals. One stalk of celery contains about 10 calories and 1.6 grams of dietary fiber. The vegetable is relatively high in sodium, with 32 milligrams per average stalk.
Celery is a good source of vitamin K and also contains small amounts of vitamin C, A and B. One cup of celery contains 30 percent of the daily recommended intake of vitamin K. Celery is also rich in antioxidants and contains folate, potassium and molybdenum.
Celery leaves and greens are even more nutritious, containing five times more magnesium and calcium than the stalks. Celery seeds are considered a natural diuretic.