"I don't think people realise how limited they'll be eating only 500 calories a day on a 5:2 diet. It means no rolls, no wraps, no cereals, no dining out...
That definitely sounds like she thinks you do it everyday. No dining out for two days a week? Wow what a hardship.
Either way, anyone who's trying to carry out normal activities such as working, exercising, driving or operating machinery on 500 calories would find that they're very tired and a bit airy-fairy
I've been down the allotment today cutting the grass in the blazing heat, with only water to sustain me. I felt fine, certainly not 'airy fairy'.
A successful weight-loss program requires a complete lifestyle change, but all this to-ing and fro-ing on a fasting diet means that people are unlikely to change their relationship with food.
This last comment couldn't be more wrong if it tried. My eating habits have changed massively since I started this way of eating and from what I've read on this forum, I'm not alone in that.