(FOX NEWS) — Experts say a New Zealand woman’s 2-gallon-a-day Coca-Cola habit probably contributed to her death, a conclusion that led the soft-drink giant to note that even water can be deadly in excessive amounts.

Natasha Harris, a 30-year-old, stay-at-home mother of eight from Invercargill, died of a heart attack in February 2010. Fairfax Media reported that a pathologist, Dr. Dan Mornin, testified at an inquest Thursday that she probably suffered from hypokalemia, or low potassium, which he thinks was caused by her excessive consumption of Coke and overall poor nutrition.

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