"She said: "I followed it to the letter - no coffee, no pulses, no potatoes - and I was certainly losing weight"

"I think the diet was just all protein and fat and no carbs and my sugar levels had just gone absolutely haywire"

Doesn't sound to me like she was following it to the letter. No carbs? Also, it sounds to me like she was going through carb withdrawls. Her heart was pounding, so she ate some chocolate and she felt better? Sounds a lot like a drug addict needing a fix, doesn't it?