Death by starvation.

[Ocelot II]

4. Some extreme diets can be very dangerous.

Water-only fasting for a few days has become something of a fad, but it's unsafe and can have serious metabolic effects if it's continued for longer than that. If this woman had been existing on nothing but water for four months, the sad result wasn't surprising. People do lose weight quickly if they don't eat any actual food, and that encourages them to continue not to eat, but they are messing up their bodies in a lot of ways. I'm very sorry for your friend, and it's sad that nobody knew what she was doing and so could encourage her to find a safer diet, even one that didn't work as quickly. Being overweight does suck and people who pick on others on account of their weight are assholes.*


*I am making an exception to this rule for TFG because even though he's overweight he ridicules other overweight people.