There are no details. What was she eating?

If one hears that 'everybody does Atkins', learns from a newspaper clipping that it's deemed 'high-protein', already 'knows' that 'fat is evil' and then puts all the pieces together, one comes up with a chicken and tunafish diet.

Yes, that'll kill you. It's called rabbit starvation. It's also purported to be a torture technique in SE Asia somewhere (don't remember where I saw that).