You aren't going to get fat eating celery.    It's amazing how many people say, "oh I don't like celery," when I tell them it is one of the best weight loss foods possible.  The other reaction I sometimes get is, "oh I love celery!!  I put peanut butter (or cheez whiz) right down the middle.  It's so good!"  It's hard informing them that too much peanut butter is not healthy and cheez whiz is shit after I just told them celery is good.