Don't be fooled by people that say Celery has nothing but water and fiber in it.

The benefits of celery begin with it being an excellent source of antioxidants and beneficial enzymes, in addition to vitamins and minerals such as vitamin K, vitamin C, potassiumfolate and vitamin B6.

Administered as an anti-hypertensive agent for centuries, celery continues to prove that there are many cardiovascular benefits as well. In recent pharmacological studies, celery demonstrates both antioxidant and anti-inflammatory activities that help improve blood pressure and cholesterol levels, as well as prevent heart disease.

Celery also provides dietary fiber that boosts digestion and weight loss. In addition, celery’s high percentage of water and electrolytes can prevent dehydration, and special compounds help celery to act as a diuretic and reduce bloating. As a supplier of antioxidant flavonoids and polyphenol phytonutrients, other significant benefits of celery include its ability to improve liver, skin, eye and cognitive health.

Much of the same information pertains to Iceberg lettuce as well.  There is more in it than the general public knows.  Don't be duped until you have read the scientific literature regarding these items.