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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.
Yes, it is safe to eat celery while expecting. However, you need to wash the vegetable properly before you eat it. Unwashed celery may contain several harmful parasites and bacteria that can make you suffer from hazardous food-borne diseases, such as listeriosis and toxoplasmosis, during pregnancy.