“I can just as accurately state that water is poison to the human body.”
Water can cause death by asphyxiation, or by over diluting body fluids (as has happened a few times with marathon runners who have over hydrated their bodies. Water is not poison by any stretch of the immagination nor by any stretch of science.
That is not correct. Water can be a poison just as fluorides can be a poison. Both are beneficial in some amounts and damaging, even deadly in other amounts.