Limewater has been used for thousands of years in food preparation.
Yes, and as I pointed out to you in the past the limewater is removed from the food or neutralized before the food is consumed. Why? Because limewater is caustic and will burn the tissues.
By the way sulfur dioxide is also used in the preparation of foods and other things. Does this mean that it is safe to ingest? How about sodium chlorite or hydrochloric acid also used in food preparation. Would you be willing to ingest these just because they are used in food preparation?