From your post...
While no formal proof emerged, the medical records note that the combination of aggressive weight loss, diet control and excessive hydration raised questions about Theresa suffering from Bulimia,
But if you read the following even though green tea may contain potassium it also is fluid and to much fluid acts as a dieretic and could wash it all away.
I don't know where you got the idea that it was green tea that she was drinking. If they made that claim, I missed it somewhere. Also, it doesn't say she exercised at all, much less in hot conditions. What you posted is actually confusing, as it says that you should drink 6-8 glasses of water, then states that water acts as a diuretic...if you don't drink enough water, you will get dehydrated, if you drink too much water, you will get dehydrated. It's one of those "Damned if you do and damned if you don't" scenarios. However, it does point out that kidney function plays a role...maybe that was the problem. I just know that I drink at least that much iced tea per day, plus at least 3 glasses of water, not to mention that I don't add salt to anything and I don't have any problems at all. They apparently were never able to prove that the tea was the cause...as I stated before, I work with research scientists and "in theory" is "research-speak" for just plain "We don't know".