> Worse, if we drink too much water too fast, we can throw off our electrolyte balance and develop hyponatremia—abnormally low levels of sodium in the blood—which is just as deadly if not more so than dehydration.

I remember reading a news article about the tragic death of a young girl from this. It was at her birthday party. Her friends got her some MDMA, which she had never tried before, and she freaked out, locked herself in the bathroom, and drank an unbelievable amount of water. Her sodium levels tanked, her brain swelled, and she died.

As a tangent, the news article was titled something like "MDMA kills teen", as if the drug had poisoned her, rather than blaming ignorance and sodium depletion from drinking too much water.