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In brief: Probably. Celery is mostly fiber and water with little food content. It has been estimated that the calories expended in preparation, eating and digesting celeray are higher than the amount ingested by eating celery. Thus you can loss calories whilst filling yourself as long as you eat plain celery. Nothing untoward can come from eating celery.
Generally, its stalks are consumed the most but you can also eat the leaves and roots of celery to get additional health benefits. This vegetable can be enjoyed in salads as well as cooked foods like celery soups. In addition to the vegetable, celery seeds are used as a spice and resemble cumin seeds in appearance.