In this undated photograph, Natasha Harris, 30, is seen. Harris, stay-at-home mother of eight from Invercargill, died of a heart attack in February 2010. Experts say the 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. (AP Photo/New Zealand Herald) NEW ZEALAND OUT, AUSTRALIA OUT, EDITORIAL USE ONLY

Associated Press
In this undated photograph, Natasha Harris, 30, is seen. Harris, stay-at-home mother of eight from Invercargill, died of a heart attack in February 2010.  Experts say the 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. (AP Photo/New Zealand Herald) NEW ZEALAND OUT, AUSTRALIA OUT, EDITORIAL USE ONLY
In this undated photograph, Natasha Harris, 30, is seen. Harris, stay-at-home mother of eight from Invercargill, died of a heart attack in February 2010. Experts say the 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. (AP Photo/New Zealand Herald) NEW ZEALAND OUT, AUSTRALIA OUT, EDITORIAL USE ONLY
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